Alasdair Óg

Alasdair Óg Mac Domhnaill
Lord of Islay
The seal of Alasdair Óg. The device shows a galley manned by two men attending the ropes. The seal's legend reads "S' ALEXANDRI DE ISLE".
Predecessor	Aonghus Mór mac Domhnaill
Successor	Aonghus Óg Mac Domhnaill?
Died	1299?
Noble family	Clann Domhnaill
Spouse(s)	Juliana
Father	Aonghus Mór mac Domhnaill

Alasdair Óg Mac Domhnaill (died 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 Alexander III, King of Scotland in 1286. 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.