Uilleag de Burgh

Sir Ulick de Burgh or Burke, 1st Clanricarde (died 1343 or 1353) was the leader of one of the three factions who fought the Burke Civil War in the 1330s. By the end of the conflict he had established himself and his descendants as Clanricarde, also known as the Mac William Uachtar (Upper Mac William), independent lords of Galway. He was succeeded by his son, Richard Óg Burke.
Family background.
There are differing views as to Burke's ancestry. 
According to the Book of the Burkes ("Historia et Genealogia Familiae de Burgo"), a genealogical manuscript made in the 1570s for Seaán mac Oliver Bourke of the Burkes of County Mayo, Burke was a son of Richard an Fhorbhair mac William de Burgh, a natural son of William Laith de Burgh, who was a son of Richard Óg de Burgh, illegitimate son of William de Burgh (d. 1206) original founder of the de Burgh/Burke dynasty in Ireland. The same descent is given by Duald MacFirbis in his "Leabhar na nGenealach" (Book of the Genealogies), mostly compiled in 1649-50, and its revised abridgement the "Cuimre na nGenealach" (Binding of the Genealogies) of 1666. This is the ancestry presented by John O'Hart in his "Irish pedigrees; or, The origin and stem of the Irish nation" (1876), and in the Oxford "A New History of Ireland" (1984), where the authors write "The origins of the Clanricard line are not absolutely proven, but the descent given is that in the best Irish genealogical sources and is not contradicted by contemporary sources." 
On this view, Burke would have been the leader of an illegitimate branch of the de Burgh family that were already strong in south Connaught, and were able to use the conflict of the 1330s to establish themselves as an independent lordship. The name "Clanricarde", first recorded in 1335, would reflect their ancestry from Richard Óg de Burgh, and might have already been in informal use for a number of generations.
However, as noted by Martin J. Blake in 1911, the pedigree above is not without its problems. In particular, William Liath de Burgh, the founder of the Franciscan Abbey in Galway, is known to have died in 1324. As Blake writes "it is obvious, having regard to these dates, that he could hardly have been a grandson (as these writers represent him to be) of the first William de Burgh in Ireland, who died early in A.D. 1206 as the English State Records prove." The MacFirbis pedigree also omits Burke's successor Richard Óg Burke, whose existence is well attested. Blake concludes that MacFirbis and the earlier manuscript "are accurate as regards the genealogy they give of the Mac William Bourkes of Mayo (Mac William Eighter) but that they had no accurate information regarding the early part of the pedigree of the Mac William Burkes of Clan-Ricard (Mac William Oughter) and could only make a guess at it–with the not surprising result, that they made a mess of it."
A different ancestry for Burke was given by John Lodge in his "Peerage of Ireland" (2nd ed, 1789), and followed by Edmund Lodge in his "Genealogy of the Existing British Peerage" (1832). 
According to this version William Liath de Burgh was identical with the William de Burgh who was the son of William Óg de Burgh, that died at the Battle of Áth an gCeap in 1270, and father of Walter Liath de Burgh, whose starving to death in 1332 triggered the Burke civil war. On this view William Liath de Burgh was the dominant Anglo-Norman noble in all Connaught, second in authority only to his cousin Richard Óg de Burgh, 2nd Earl of Ulster among the de Burghs. Ulick de Burgh is presented as the son of William Liath de Burgh, and so brother to Edmond Albanach de Burgh and Walter de Burgh, with Ulick and Edmond ultimately partitioning Connaught between themselves at the end of the conflict as brothers. Blake asserts that the Burke who was a son of Richard an Fhorbhair should be identified with Ulick Burke of Umhaill, ancestor of the Bourkes of the Owles, in County Mayo.
Moreover, recent scholarship has shed light on the true early ancestry of the de Burgh (Burke) family, most notedly that Richard Óg de Burgh, illegitimate son of William de Burgh (d. 1206), never existed and was a complete genealogical invention. Both Oxford Dictionary of National Biography articles published in the 21st century on William de Burgh (died 1206) and his son Richard de Burgh (died 1243) confirm that the elder William (died 1206) had only one son named Richard de Burgh (died 1243). As such, it is widely accepted amongst eminent genealogical historians that William de Burgh (died 1206) had just three sons (Richard Mór de Burgh, 1st Lord of Connacht; Hubert de Burgh, Bishop of Limerick; and William de Burgh, Sheriff of Connacht) with only one being named Richard de Burgh. Therefore, it is Richard Mór de Burgh's (died 1243) youngest son, William Óg de Burgh (died 1270), who is the ancestor of the Clanricarde. The family tree below represents the best scholarship on the different branches and lines of descent of the early de Burgh (Burke) family.
The First "Clanricarde".
On the death of Richard Óg de Burgh, 2nd Earl of Ulster in 1326, the earldom passed to his grandson William Donn de Burgh, 3rd Earl of Ulster, then 14 years old. William became increasingly estranged and suspicious of his two principal lieutenants, Henry de Mandeville in Ulster and Walter de Burgh in Connaught. In 1331 he had Henry de Mandeville arrested, and the following year he had Walter de Burgh with two of his brothers captured and imprisoned. He then ordered that Walter should be starved to death. Gylle de Burgh, the sister of Walter and wife of Robert de Mandeville, Henry's brother, plotted revenge and in June 1333 the young Earl was cut down as he passed through Carrickfergus by members of his own retinue, members and associates of the de Mandeville family.
This action triggered open civil war between the different branches of the de Burgh family. The Earl's heir-general, his infant daughter, Elizabeth de Burgh, 4th Countess of Ulster, was taken to England on her father's death and lost control over her lands. Warfare broke out among the Gaelic-Irish tenants of the late Earl – many of whom expelled the Anglo-Irish – and among the three principal members of the de Burgh family:
A series of raids and counter-raids ensued, with Edmond de Burgh reportedly laying waste much of Connaught in 1335. But in 1338 Edmond de Burgh was cornered and caught at Ballinrobe by his cousin Edmond Albanach, who according to the Annals of the Four Masters "fastened a stone to his neck and drowned him in Lough Mask".
In the aftermath by 1340 the much-weakened family had divided into three separate, independent lordships:
Ulick remained Clanricarde until his death in 1343 (or 1353 ?), to be succeeded by his son, Richard Óg Burke.
He is said to have possessed an unusual nickname — "Bod-an-Balcuigh", which translated to "Penis of Power".
Family tree.
 Walter de Burgh of Burgh Castle, Norfolk.
 =Alice
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 William de Burgh, died 1206. Hubert de Burgh, 1st Earl of Kent, d. 1243. Geoffrey de Burgh, d. 1228. Thomas de Burgh
 | (issue; John and Hubert) 
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 Richard Mór de Burgh, 1st Baron of Connaught Hubert de Burgh, Bishop of Limerick, d. 1250. William de Burgh, Sheriff of Connacht Richard Óge de Burgh (*Did not exist*)
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 de Burgh Earl of Ulster, William Óg de Burgh, d. 1270 
 Burke of Castleconnell, County Limerick | 
 Mac William Iochtar Bourke of County Mayo. | 
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 Sir William liath, d. 1324 
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 Walter, d. 1332 Sir Edmund Albanach, d. 1375 Richard an Fhorbhair Raymund Ulick of Umhall
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 Ulick Burke of Annaghkeen, d. 1343. Raymond Walter Óge
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 Richard Óg Burke, d. 1387.
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 Ulick an Fhiona Burke of Clanricarde