Burke's Extinct Peerage has the following article on the Barons Ros:

*** Part 1 - Ros of Hamlake ***

  "That Peter, the ancestor of this great and noble family," says Dugdale, "did originally assume his surname in the time of Henry I., from that lordship in Holderness, called Ros, where he then had his residence, needeth not to be doubted." This
  Peter de Ros, or Roos, a feudal baron, m. Adeline, one of the sisters and co-heirs of the famous Walter Espec, Lord of the manor of Helmesley, called sometimes Helmeslac but often Hamlake, in the north riding of Yorkshire, and was s. at his decease, by his son,
  Robert de Ros, who, in the 3rd Henry II., paid 1,000 marks of silver to the king for livery of the lands inherited by his mother from her brother, Walter Espec. This Robert was a munificent benefactor to the Knights Templars. He m. Sybell de Valoines (who, after his decease, m. Ralph de Albini,) and dying sometime about the middle of the 12th century, was s. by his son.
  Everard de Ros, a minor, and in ward to Ranulph de Glanvil. In the 12th Henry II., this feudal lord held of the crown eight knghts' fees, and in two years afterwards, upon collection of the aid for marrying the king's dau., answered 112d. for those which were de veteri feoffamento, and 31s. 1d. for what he had de novo. He m. Roysia, dau. of William Trusbut, of Wartre, in Holderness, and at the decease of her brothers, s.p., co-heir to her father's estate, which estate was eventually inherited by her descendants, Lords Ros, her sisters and co-heirs having no posterity. They had two sons. This Everard de Ros must have been a very considerable personage at the period in which he lived, for we find him in the year 1176, paying the then very large sum of �526 as a fine for his lands, and in four years subsequently, �100 more to have possession of those which the Earl of Albermarle held. He d. about 1186, and was s. by his elder son,
  Robert de Ros, surnamed Furfan, who, in the 1st Richard I., paid 1,000 marks fine to the crown for livery of his lands. In the 8th of the same reign, being with the king in Normandy, he was committed to the custody of Hugh de Chaumont, for what offence appears not; with especial charge to the said Hugh, that he should keep him as safe as his own life; but Chaumont trusting William de Spiney with his prisoner, that person being corrupted, allowed him to escape out of the castle of Bonville. De Ros eventually gained nothing, however, by this escape, for Richard caused him nevertheless to pay 1,200 marks for his freedom, while he had the false traitor Spiney, hanged for his breach of faith. In the next reign, however, Robert de Ros found more favour, for upon the accession of King John, that monarch gave him the whole barony of his great-grandmother's father, Walter Espee, to enjoy in as large and ample a manner as he, the said Walter, ever held it. Soon after which he was deputed, with the bishop of Durham, and other great men, to escort William, King of Scotland into England, which monarch coming to Lincoln, swore fealty there to King John, upon the cross of Hubert, archbishop of Canterbury, in the presence of all the people. About the 14th of King John's reign, Robert de Ros assumed the habit of a monk, whereupon the custody of all his lands, viz., Werke Castle, in the co. Northumberland, with his whole barony, was committed to Philip de Ulcote, but he did not continue long a reclude, for we find him the very next year executing the office of sheriff for the county of Cumberland. At the commencement of the struggle between the barons and John, this feudal lord took part with the king, and obtained, in consequence, some grants from the crown; but he subsequently espoused the baronial cause, and was one of the celebrated twenty-five appointed to enforce the observance of Magna Charter. In the reign of King Henry III. he seems, however, to have returned to his allegiance, and to have been in favour with that prince, for the year after the king's accession, a precept was issued by the crown to the sheriff of Cumberland, ordering the restoration of certain manors granted by King John to De Ros. This feudal lord was the founder of the castle of Helmesley, otherwise Hamlake, in Yorkshire, and of the castle of Werke, in Northumberland - the former of which he bequeathed to his elder son - the latter to the younger, with a barony in Scotland, to be held of the elder by military service. In his latter days he became a Knight Templar, to which order himself and his predecessors had ever been munificently liberal, and dying in that habit, anno 1227, was buried in the Temple Church. Robert de Ros m. Isabel, natural dau. of William the Lion, King of Scotland, and widow of Robert de Brus, and had issue two sons,
  William, his successor.
  Robert, Baron Ros, of Werke, concerning whom see [Part 2, below].

He was s. by his elder son,   William de Ros, of Hamlake, who, upon giving security for the payment of �100 for his relief, had livery of his lands. This feudal lord, in the lifetime of his father, was an active supporter of the baronial cause, and was made prisoner at the battle of Lincoln (1st Henry III.,) by the royalists, but soon after released and delivered up to his father upon bail. He was subsequently engaged in the wars of Gascony, and he had two military summonses in the 42nd Henry III., to march against the Scots and Welsh. By the deaths of his two great aunts, the sisters of his grandmother, Rose Trusbut, s.p., he became sole heir of the baronial estate of Trusbut and Watre. He m. Lucia, dau. of Reginald Fitz-Piers, of Blewleveny, in Wales, and d. in 1258. He was s. by his son,
  Robert de Ros, who had m. in the lifetime of his father, Isabel, dau. and heiress of William de Albini, feudal lord of Belvoir in Leicestershire, by whom he acquired Belvoir Castle, co. Lincoln (see Daubney, Barons Daubneney, and Earl of Bridgewater), and other extensive landed possessions. This great heiress was in ward to the king, and a mandate upon her marriage, bearing date at Windsor, 17th May, 1244, was directed to Bernard de Savoy and Hugh Giffard, to deliver her to her husband, the said Robert: "but not," says Dugdale, "without a round composition, for it appears that both he and his wife, in the 32nd Henry III., were debtors to the king in no less than the sum of �3,285 13s. 4d., and a palfrey; of which sum the king was then pleased to accept by 200 marks a year until it should be all paid," In the 42nd of the same reign he had two military summonses with his father, to march against the Scotch and Welsh - but afterwards rearing, with the other barons, the standard of revolt, he had a chief command at the battle of Lewes, so disastrous to the royalists; and to his custody in the castle of Hereford, was especially committed the person of Prince Edward. He was at the same time summoned 24 December, 1264, as Baron de Ros, to the parliament then called in the king's name by the victorious lords. But the fortune of war changing at the subsequent battle of Evesham, his lands were all seized by the crown, and held until redeemed by his lordship under the Dictum of Kenilworth. I two years after this he must, however, have regained somewhat of royal favour, for the had then permission to raise a new embattled wall around the castle of Belvoir. He d. 16 June, 1285, leaving issue by the heiress of Belvoir,
  William, his successor.
  Robert (Sir), knighted 1296.
  Isabel, m. to Walter de Fauconberge.

His Lordship was s. by his elder son,
  William de Ros, 2nd baron, b. 1255, summoned to parliament as Baron Ros, of Hamlake, from 23 June, 1295, to 6 October, 1315. This nobleman was one of the competitors for the crown of Scotland in the 19th Edward I., 1296, through his grandmother, Isabel, natural dau. of William the Lion, King of Scotland. He was subsequently engaged in the wars of Gascony and Scotland, and discovering the intention of his kinsman, Robert de Ros, then Lord of Werke, to deliver up that castle to the Scots, he lost no time in apprising the king, who thereupon despatched him with 1000 men to defend that place, but the Scots attacking this force upon its march, but it to pieces; when Edward himself advancing from Newcastle-upon-Tyne, soon obtained possession of the fort, and appointed Lord Ros its governor - allowing him, during his absence in Gascony, to nominate his brother, Robert, lieutenant. In a short time after, he had a grant of this castle, with its appurtenances, forgeited by the treason of his before-mentioned kinsman; and for several subsequent years, his lordship was actively engaged in Scotland. In the 1st Edward II., he was constituted the king's lieutenant, between Berwick and the river Forth, and in six years afterwards, he was appointed warden of the west marches of Scotland. He m. Maud, or Matilda, one of the daus. and co-heris of John de Vaux, who brought him the manor of Feston, and lands in Boston, co. Lincoln, and had issue,
  I. William, his successor.
  II. John, a very eminent person, temp. Edward II. and Edward III. In the former reign, he took an active part against the Spencers, and, upon the accession of the latter king he was appointed steward of the household, and entrusted with a command in Scotland. He was likewise constituted one of the governors of the young monarch. In the 10th of the same reign he was made admiral of the seas, from the river Thames, northwards; and the next year, he was with the king in Gascony, as he was again in two years afterwards. He was summoned to parliament as Baron de Ros, from 27 January 1332, to 15 June 1338, but d.s.p. in the latter year, when the barony became extinct, while his property devolved upon his brother, William, Lord Ros, of Hamlake.
  III. Thomas.
  I. Margaret.
  II. Anne, m. to Paine, son of Robert de Tibetot.
  III. Mary, m. 1st, to William Braose, and 2ndly, to Thomas de Brotherton, Duke of Norfolk.

His lordship d. in 1315, and was s. by his elder son,
  William de Ros, 3rd baron, summoned to parliament, from 20 November, 1317, to 12 September, 1342. This nobleman, in the 5th Edward II., was one of the commissioners appointed to negotiate peace with Robert Bruce, King of Scotland, about which time he came to an agreement with the king, regarding the castle of Weke, which he then exchanged with the crown for other lands. He was subsequently much engaged in the wars of Gascony and Scotland. His lordship m. Margery, elder sister and co-heir of Giles de Badlesmere, of Ledes Castle, in Kent, a great feudal baron, by whom he had issue,
  William, his heir.
  Thomas, who s. his brother.
  Margaret.        Maud, m. to John, Lord Welles.
  Alice, m. Nicholas, Lord Mernell.
  Milicent, m. to William, Lord d'Eyncourt.
He d. 16 February, 1342-3, and was s. by his elder son,
  William de Ros, 4th baron, b. 1326, summoned to parliament, from 25 November, 1350, to 20 November, 1351. This nobleman was one of the eminent martial characters of the glorious reign of Edward III. He was at the memorable battle of Cressy, a leader in the 2nd brigade of the English army; he had a command at Newcastle-upon-Tyne, in the conflict, where David Bruce, King of Scotland, and many of his nobles, after sustaining a defeat, fell into the hands of the English; and he was subsequently (21st Edward III) at the siege of Calais with the Black Prince. His lordship m. Margaret, dau. of Ralph, Lord Nevill (who m. after his decease, Henry, Lord Percy), but dying in the Holy Land, in 1352, s.p., he was s. by his brother,
  Thomas de Ros, 5th baron, summoned to parliament, front 24 August, 1362, to 3 March, 1384. This nobleman was also engaged in the French wars, and is supposed to have shared the glory of Poictiers. His lordship m. Beatrix, dau. of Ralph, 1st Earl of Stafford, and widow of Maurice, Fitz-Maurice, 2nd Earl of Desmond, by whom he had issue, John, William, Thomas, Robert, Elizabeth, m. 1st to Lord Zouche, of Haryngworth, and 2ndly, to Thomas, son and heir of Roger, Lord Clifford; and Margaret. He d. in 1384, and was s. by his eldest son,
  John de Ros, 6th baron, summoned to parliament, from 8 August, 1386, to 13 November, 1393. This nobleman was in the naval expedition in the 11th Richard II., under Richard, Earl of Arundel, and the next year he was joined with Henry, Earl of Northumberland, and Ralph, Lord Nevill, in the government of Carlisle, and wardenship of the west marches of Scotland. his lordship, who was not less distinhuished for piety than valous, d. upon his pilgrimage to Jerusalem, at Paphos, in the Isle of Cyprus, anno 1393-4. He m. Mary, dau. of Henry de Percy, but having no issue, was s. by his brother,
  William de Ros, 7th baron, summoned to parliament, from 20 November, 1394, to 24 December, 1413. This nobleman was appointed lord treasurer of England, in the 4th Henry IV., and in the 6th he obtained, in consideration of his services, a grant from the crown of 100 marks per annum for his life, to be paid out of the exchequer. In the 16th of the same reign, being then one of the king's council, and in such esteem that his residence near the court was deemed indispensable, he had the town of Chyngilford, in Essex, assigned him, for the abode of his servants and horses. It was about this period that his lordship preferred a complaint in parliament against Robert Tirwhit, one of the justicea of the King's Bench, for withholding from him, and his tenants, of the manor of Melton Roos, co. Lincoln, certain commonage of pasture and turbay, and with lying in wait for him, with 500 men. To which charges, Mr. Justice Tirwhit pleading fuilty in the presence of the king, and craving pardon, the case was referred to the chief justice, Sir William Gascoigne, who determined that Tirwhit, attended by all his party, should meet Lord Ros, at the common in dispute, and bring with him two tuns of Gascony wine, with two fat oxen, and twelve fat sheep, as provision for a dinner, to be then eaten by the assembled friends and adherents of the disputants, and that Tirwhit, in the presence of all, should make Lord Ros, a most submissive apology, tendering him, at the same time, 500 marks, as a compensation. To which, it was also settled by the arbitrator, that the baron should reply; "At reverence of the king, who hath shewed himself to be a good and righteous lord; I will take nothing but the oxen and sheep, for the dinner of those here collected." A free and open act of forgiveness was to follow this speech to Tirwhit and his partisans, and thus the matter terminated. His lordship m. Margaret, day. of Sir John Arundel, son of John Fitzalan, Lord Maltravers, 2nd son of Richard, 9th Earl of Arundel. Lord de Ros d. at Belvoir, 1 September, 1414, having had issue,
  I. John, of whom presently.
  II. Thomas.
  III. Robert (Sir), whose dau., Elizabeth, m. 1st, Robert Lovel, 2ndly, Thomas Pronde, and 3rdly, Sir Richard Haut.
  IV. William.
  V. Richard, who had a dau., Mary, m. to Sir Giles Capel.
  I. Beatrice, a nun.        II. Alice.
  III. Margaret, m. 1st, Reignald, Lord Grey de Ruthyn, and 2ndly, to James, Lord Audley.
  IV. Elizabeth, m. to Robert, 6th Lord Morley.

The eldest son,
  John de Ros, 8th baron, but never summoned to parliament. His lordship was retained in the 4th Henry V., to serve the king in France, being then scarcely eighteen years of age. In two years afterwards he was with the Duke of Exeter and Clarence at the siege of Roan, where he so gallantly distinguished himself, that he had a grant of the castle of Basqueville, in Normandy, to himself and his heirs male for ever. Continuing in those wars, he was slain within two years, anno 1421, at Beaug�, in which disastrious battle his brother, William de Ros, as well as the Duke of Clarence (under whom he served), and a great many of the flower of the English nobility fell. His lordship m. Margaret, day. and heir of Sir Philip Despenser, but having had no issue (his widow m. 2ndly, Sir Roger Wentworth), was s. by his next brother,
  Sir Thomas de Ros, 9th baron, summoned to parliament 12 July, and 3 August, 1429. This nobleman m. Alianor, dau. of Richard Beauchamp, Earl of Warwick, and was s. at his decease, 18 August, 1431, by his eldest son,
  Thomas de Ros, 10th baron, b. 9 September , 1427. During the minority of this nobleman, his great uncle, Sir Robert Ros, Knt., was deputed by the king to perform the office of chamberlain to the archbishop of Canterbury upon the day of his installation, which office belonged to the Lord Ros, in right of the tenure of a certain manor. His lordship, who was in ward to the crown, had, by especial favour, the livery of his lands in the 24th Henry VI. In the memorable contests commenced in that monarch's reign between the houses of Lancaster and York, Lord Ros entered zealously into the cause of the former, and participated in its disasters, particularly at the battle of Towton-field. Being with the king at York, when tidings of the defeat reched the unfortunate monarch, he fled with his royal master to Berwick, and was attainted in the 1st Edward IV., when his lands were confiscated, and Belvoir Castle granted to the Lord Hastings, who eventually dismantled the splendid structure, which remained from that period little better than a heap of ruins until the reigns of Henry VIII. and Elizabeth, when its renovation was commenced, and completed by Thomas and Henry Manners, 1st and 2nd Earls of Rutland. His lordship m. Philippa, dau. of John, Lord Tiptoft, and sister and co-heir of John, Earl of Worcester, and by her (who m. 2ndly, Sir Thomas Wingfield, and 3rdly, Edward Grimston) had issue,
  Edmun.        John, d.s.p.
  Eleanor, m. to Sir Robert Manners, M.P., ancestor of the Earls and Dukes of Rutland and of the present Lord de Ros.
  Isabel, m. 1st, to Sir Thomas Everingham, 2ndly, to Thomas Grey, youngest son of Sir Ralph Grey, of Werke, and 3rdly, to Sir Thomas Lover, K.G.; she d.s.p. 1524.
  Margaret, d. unm.

Lord Ros was summoned to parliament from 2 January, 1449, to 30 July, 1460. He was attainted 4 November, 1461, and his honours thereuon became forfeited. He d. in the same year. The Barony of Ros lay under the attainder until the complete triumph of the Lancastrians, by the accession of King Henry VII, when the elder son,
   Edmund de Ros, obtained (1st Henry VII.) an act of parliament, annulling and making entirely boid the act by which his father was attainted, and restoring to him all the estates and honours of the family. He was never, however, summoned to parliament. His lordship d. 13 October, 1508, unm., when the Barony of Ros fell into Abeyance between his three sisters and co-heirs, but the two younger sisters having d.s.p., the abeyance terminated in facour of Sir Geroge Manners, the son and heir of Sir Robert and Lady Eleanor Manners. His eldest son was created Earl of Rutland, and the title of Ros descended for some gneerations in that family. (For particulars refer to Burke's Peerage).
  Thus terminated the male line of the family of De Ros, Barons Ros, of Hamlake, but the barony has long survived its original possessors, and after having remained in abeyance from the year 1687, was after the lapse of nearly a century and a quarter, called out of abeyance in 1806 in favour of Lady Henry Fitzgerald, who assumed the additional surname of De Ros, and was mother of the late and present Lords de Ros. For particulars of more recent lineage, refer to the Extant Peerage.

    Arms - Gules, three water-bougets, argent.

*** Part 2 - Ros of Werke ***

  Robert de Ros, feudal Lord of Hamlake [see part 1, above], conferred the castle and Barony of Werke, co. Northumberland, which he held of the crown by the service of two knights' fees, upon his younger son,
  Robert de Ros, who, in the 21st Henry III., was constituted chief justice of the forest in the counties of Nottingham, Derby, York, Lancaster, Northumberland, and Cumberland, which office he held for several years afterwards. In the 39th of the same reign he made a temporary surrender of his castle of Werke to the king, who was then advancing with an army upon Scotland, and deemed it impolitic to permit so strong a fort to remain in private hands. About this time charges were preferred against Robert de Ros, to whose care and guidance, with John de Baliol, the kingdom of Scotland, as well as its King, Alexander III., and the Queen Margaret (dau. of the English monarch), were committed, for arbitrary conduct in the discharge of his duty; for which he was, eventually, fined no less than 100,000 marks, but his innocence appearing afterwards manifest, the penalty was entirely remitted. In the 22nd Edward I, he had summons with other of the barons to repair to the king, to advise upon the affairs of the realm; and the next year he was summoned to parliament, 24 June, 1 October, and 2 November, by writ addressed "Roberto de Roos de Werke," but never afterwards. In a short time, subsequently, however, falling in love with a Scottish lady, he deserted to the Scots, having previously endeavoured to seduce from his allegiance, his kinsman, Lord Ros, of Hamlake. But that nobleman repairing to King Edward divulged the treason, and was forthwith despatched at the head of 1,000 men to take possession of Werke, whither he was proceeding, when Robert de Ros, with a great body of Scots, surprised him at the village of Prestfen, and cut the whole English force to pieces. King Edward very shortly, however, most amply avenged himself, at the battle of Dunbar, where no less than 10,053 Scotsmen fell; and Werke coming into the possession of the crown, was conferred upon Lord Ros, of Hamlake.
  Robert, Lord Ros, of Werke, m. Margaret, one of the four sisters and co-heirs of Peter de Brus of Skelton, but regarding his heirs the records differ, but the more reliable state that he had a son, William, to whom his mother gave the castle of Kendal; and from whom descended his eventual heir Elizabeth de Ros, m. Sir William Parr, Knight, from whom sprang the Parrs of Kendal, ennobled by that title, which see. The barony of Ros of Werke expired under the treason of the baron.

  Arms - Gules, three water-bougets, argent.

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