Lachlann Mac Ruaidhrí

Lachlann Mac Ruaidhrí
Now-ruinous Castle Tioram may have once been a principal stronghold of Clann Ruaidhrí.
Predecessor	Ailéan mac Ruaidhrí
Successor	Ruaidhrí Mac Ruaidhrí
Noble family	Clann Ruaidhrí
Father	Ailéan mac Ruaidhrí

Lachlann Mac Ruaidhrí (fl. 1297–1307/1308) was a Scottish magnate and chief of Clann Ruaidhrí. He was a free-booting participant in the First War of Scottish Independence, who remarkably took up arms against figures such as John, King of Scotland, Edward I, King of England, the Guardians of Scotland, and his near rival William II, Earl of Ross. Lachlann disappears from record in 1307/1308, and appears to have been succeeded by his brother, Ruaidhrí, as chief of Clann Ruaidhrí.

Lachlann was an illegitimate son of Ailéan mac Ruaidhrí (died ×1296), a son of Ruaidhrí mac Raghnaill, Lord of Kintyre (died 1247?),eponym of Clann Ruaidhrí. Ailéan had another illegitimate son,Ruaidhrí (died 1318?), and a legitimate daughter,Cairistíona (fl. 1290–1318). It was Lachlann's generation—the second generation in descent from Ruaidhrí mac Raghnaill—that members of Clann Ruaidhrí are first identified with a family name derived from this eponymous ancestor. For example, the sons of Ailéan are called "filiis Rodrici" in one record, and Lachlann himself is called "Laclan Magrogri" in another. Clann Ruaidhrí was a branch of Clann Somhairle. Other branches of this overarching kindred included Clann Dubhghaill and Clann Domhnaill. Lachlann was married to a daughter of Alasdair Mac Dubhghaill, Lord of Argyll (died 1310). Lachlann was therefore not only a brother-in-law of Alasdair Mac Dubhghaill's succeeding son, Eóin Mac Dubhghaill (died 1316), but also the brother-in-law of the eponymous ancestor of Clann Laghmainn, Maol Muire mac Laghmainn (fl. 1290), and likely also brother-in-law of the chief of Clann Domhnaill, Alasdair Óg Mac Domhnaill, Lord of Islay (died 1299?).