http://www.sweeneyclanchief.com/id7.htm

Mac Sweeney Banagh: Mac Suibhne Boghaineach

"The third branch of Clann tSuibhne in Tír Conaill was that of Mac Suibhne Boghaineach, who according to Leabhar 
ChIainne Suibhne, were descended from Dubhghall Mac Suibhne, who was granted the territory of Tír Boghaine by 
his grandfather, Murchadh Mear, who, as we have seen, died about the year 1320. The district of Boghaine comprised 
the modern barony of Banagh in southwest Donegal, as well as a part of Boylagh.

The story of this branch of the Clann, because of a lack of early sources, is less clear than those of the branches in Na 
Tuatha and Fanad. Dubhghall, the founder of the branch according to Leabhar Chlainne Suibhne, was slain in 1356, 
although in the Book of Ballymote (ca. 1400) six of his grandsons are said to belong to Mac Suibhne of Connacht. 
The eldest of these, Toirdhealbhach, who is described in A. F. M. as Ard Chonsapal Connacht, or High Constable 
of Connacht, was slain in battle with two of his brothers, Donnchadh and Donn SIéibhe in 1397. It is interesting, 
however, that he is included in the seventeenth century Ó Cléirigh genealogies as being of Boghaine. From him 
descend the later lords of Banagh

The first clear mention of a Mac Suibhne Banagh in the annals is as late as 1496, when Maol Mhuire, "Mac Suibhne 
Thíre Boghaine" died. The following year another lord of Banagh is mentioned as follows: "Mac Suibhne Connachtach 
.i. Mac Suibhne Baghineach (i.e. of Banagh), Eoghan décc". This and other evidence led Father Paul Walsh to argue, 
and to show very clearly, that the Banagh branch were in fact, a late offshoot of the Connacht branch whose territory 
was Cúil Chnámh in the civil parish of Dromard, county Sligo."