. Aonghus Óg died at some point after the Battle of Bannockburn—notwithstanding the Hebridean tradition preserved by the eighteenth-century
Book of Clanranald and the
Sleat History that dates his death to about 1300. Henry Lee, in his "History of the Clan Donald" states that Angus Og died at his castle in Finlaggan on Islay in 1330 and was buried at Iona. One possibility is that he died between 1314 and 1318. This could well have been the case if the slain Clann Domhnaill chieftain at Faughart was indeed his son and successor. After 1330, the Clann Domhnaill lordship seems to have taken up by his son, Eóin Mac Domhnaill. The political situation in the Hebrides is murky between this man's accession and the disaster at Faughart, and it is possible that an after-effect of this defeat was a period of Clann Ruaidhrí dominance in the region. In 1325, a certain "''''", Ruaidhrí of Islay, suffered the forfeiture of his possessions by Robert I. Although this record could refer to a member of Clann Ruaidhrí—perhaps
Raghnall Mac Ruaidhrí—another possibility is that the individual actually refers to a member of Clann Domhnaill—perhaps a son of either Alasdair Óg or Aonghus Óg. If Ruaidhrí of Islay was indeed a member of Clann Domhnaill, and a son of Alasdair Óg, his expulsion may have marked the downfall of Alasdair Óg's descendants—Clann Alasdair—and may account for the fact that this branch of Clann Domhnaill failed to hold power in Hebrides after this date. As such, Ruaidhrí of Islay's expulsion could well mark the date upon which Clann Alasdair relocated overseas. The eclipse of Alasdair Óg's line—the senior branch of Clann Domhnaill—may explain the rise of Aonghus Óg's line. If Ruaidhrí of Islay indeed represented the line of Alasdair Óg, his forfeiture evidently paved the way for the rise of Eóin Mac Domhnaill. In fact, before the end of Robert I's reign, this son of Aonghus Óg appears to have administered Islay on behalf of the Scottish Crown, and eventually came to be the first Clann Domhnaill dynast to bear the title '''' ("
Lord of the Isles"). If Aonghus Óg was still alive in 1325, he would have witnessed Robert I's apparent show of force into Argyll within the same year. Although Aonghus Óg's tenure as chief is remarkable in regard to his close support of the Bruce cause, the later career of Eóin Mac Domhnaill saw a conspicuous cooling of relations with the Bruce regime—a distancing which may well have contributed to the latter's adoption of the title "Lord of the Isles". Aonghus Óg married Áine Ní Chatháin, an Irish woman from Ulster. According to the
Sleat History, Áine Ní Chatháin's tocher consisted of one hundred and forty men from each
surname that dwelt in the territory of her father,
Cú Maighe na nGall Ó Catháin. The
Book of Clanranald numbers the men at eighty. The Uí Catháin of Ciannachta were a major branch of the
Uí Néill kindred, and the '''' or "train of followers" that is said to have accompanied Áine Ní Chatháin is the most remarkable retinue to have arrived through a marriage from Ireland in Scottish tradition. In any case, this tocher appears similar to an historical one dating almost a century earlier, when a Clann Ruaidhrí bride brought over one hundred and sixty warriors to her Irish husband. The tradition of the Clann Domhnaill–Uí Catháin union is corroborated by the record of an English safe-conduct instrument granted to Áine Ní Chatháin, identified as the mother of Eóin Mac Domhnaill in 1338. At a later date, Áine Ní Chatháin appears to have remarried a member of
Clann Aodha Buidhe, a branch of the
Ó Néill kindred. Aonghus Óg and Áine Ní Chatháin were the parents of Eóin Mac Domhnaill. Another child of the couple may be the Áine Nic Domhnaill noted in the
Clann Lachlainn pedigree preserved by the fifteenth-century manuscript
National Library of Scotland Advocates' 72.1.1 (MS 1467). This source reveals that this woman was the wife of Lachlann Óg Mac Lachlainn, and mother of his son, Eóin Mac Lachlainn. Whatever the case, a certain daughter of Aonghus Óg was Máire, a woman who married
William III, Earl of Ross. Aonghus Óg appears to have also had another son named
Eóin, a man from whom descended the
Glencoe branch of Clann Domhnaill. Although the parentage of Alasdair of the Isles is uncertain, one possibility is that he was another son of Aonghus Óg. Domhnall of Islay could have also been his son. According to the seventeenth-century
Macintosh History, an ancestor of
Clann Mhic an Tóisigh named Fearchar married a daughter of Aonghus Óg named "''
". As Fearchar died in 1274, it suggests this source has confused Aonghus Óg and Aonghus Mór. According to the Sleat History'', an illegitimate daughter of Aonghus Mór was the mother of an early chiefly ancestor of Clann Mhic an Tóisigh. The father of this ancestor is stated to have fled to Aonghus Mór whilst on the run for committing manslaughter. Having fathered a son with Aonghus Mór's daughter, the man is stated to have campaigned with Edward Bruce in Ireland where he was slain. The
Sleat History also claims that the slain man's son—the ancestor of later Clann Mhic an Tóisigh chiefs—was brought up in Clann Domhnaill territory and endowed by the kindred with lands in
Lochaber and
Moray. Alexander Mackintosh Shaw also confirms the father of Moran to be Aonghus Mór; ''"Ferquhard's intercourse with the fair Mora of Isla was at first of an unauthorised character, and that, this being discovered, the lover fled to avoid the wrath of the powerful father. He took refuge in Ireland, but before he had been there long he was recalled, and on his return made Mora his wife."'' ==Ancestry==