Template:Wp-Alexander Óg

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Alasdair Óg Mac Domhnaill (died probably 1299) was Lord of Islay and chief of Clann Domhnaill. He was the eldest son of Aonghus Mór mac Domhnaill, Lord of Islay. Alasdair Óg seems to first appear on record in 1264, when he was held as a hostage of the Scottish Crown for his father's good behaviour. During Alasdair Óg's career, the Scottish realm endured a succession crisis as a result of the unexpected death of Margaret, Maid of Norway, heir to the Scottish throne, in 1290. One of several factions that staked a claim to the throne was the Bruce kindred. Both Alasdair Óg and his father were cosignatories of the Turnberry Band, a pact that may have partly concerned the Bruces' royal aspirations.

Aonghus Mór last appears on record in 1293, which seems to have been about the time that Alasdair Óg succeeded him as chief of Clann Domhnaill. Alasdair Óg's wife was apparently a member of Clann Dubhghaill. This marital alliance evidently brought Clann Domhnaill and Clann Dubhghaill into a territorial conflict. The chief of the latter kindred, Alasdair Mac Dubhghaill, was a close adherent to the successful claimant to the kingship, John Balliol. Following the latter's defeat and overthrow by Edward I, King of England, Alasdair Óg aligned his kindred with the English in an attempt to contend with Clann Dubhghaill. As such, Alasdair Óg was employed as the agent of English authority in the west, and Clann Domhnaill appears on record throughout the 1290s campaigning against Clann Dubhghaill, Clann Ruaidhrí, and the Comyn kindred.

Alasdair Óg's rivalry with Alasdair Mac Dubhghaill apparently brought about his own demise, as Alasdair Óg appears to be identical to the like-named man slain by Alasdair Mac Dubhghaill of Clann Dubhghaill in 1299. The Clann Domhnaill succession is uncertain following this date, as several men appear on record accorded the territorial designation "of Islay", a style that corresponded to the lordship of the Isles. Alasdair Óg is known to have had at least six sons. He was the brother of the Clann Domhnaill chief (Aonghus Óg) who was slain caimpaining in Ireland in 1318. Over the succeeding decades, the Clann Domhnaill chiefship came to be permanently occupied by the descendants of Aonghus Óg. As a result, Alasdair Óg's reputation suffered within early modern Clann Domhnaill tradition, and the history of his descendants—Clann Alasdair—was largely ignored. Nevertheless, the most prominent Clann Domhnaill gallowglass families in Ireland descended from him. Members of Clann Alasdair claimed the Clann Domhnaill chiefship into the last half of the fourteenth century. Alasdair Óg may also be the eponymous ancestor of Clann Alasdair of Loup.