Ruaidhrí mac Raghnaill was a leading figure in the Kingdom of the Isles and a member of Clann Somhairle. He was a son of Raghnall mac Somhairle and was the eponymous ancestor of Clann Ruaidhrí. Ruaidhrí may have become the principal member of Clann Somhairle following the annihilation of Aonghus mac Somhairle in 1210. At about this time, Ruaidhrí seems to have overseen a marital alliance with the reigning representative of the Crovan dynasty, Rǫgnvaldr Guðrøðarson, King of the Isles, and to have contributed to a reunification of the Kingdom of the Isles between Clann Somhairle and the Crovan dynasty.
The name of Óláfr Guðrøðarson's wife as it appears on folio 42r of British Library Cotton Julius A VII: "Lauon". This woman seems to have been a close kinswoman of Ruaidhrí, perhaps a daughter.
Ruinous Tarbert Castle. This royal fortress in northern Kyntyre seems to have been constructed in the aftermath of the Scottish campaign against Ruaidhrí. Much of the castle's visible remains date to work undertaken in the 1320s and about 1500.
Coat of arms of Alexander II as it appears on folio 146v of British Library Royal 14 C VII (Historia Anglorum). The inverted shield represents the king's death in 1249.
Now-ruinous Castle Tioram may well have been a stronghold of Ruaidhrí's Clann Ruaidhrí descendants, and possibly even of Ruaidhrí himself.
Ragnall mac Somairle was a significant late-twelfth-century magnate, seated on the western seaboard of Scotland. He was probably a younger son of Somairle mac Gilla Brigte, Lord of Argyll and his wife, Ragnhildr, daughter of Óláfr Guðrøðarson, King of the Isles. The twelfth-century Kingdom of the Isles, ruled by Ragnall's father and maternal grandfather, existed within a hybrid Norse-Gaelic milieu, which bordered an ever-strengthening and consolidating Kingdom of Scots.
Nineteenth-century depiction of the seal of Alan fitz Walter, Steward of Scotland
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Inscription of a galley depicted on Hedin Cross, a Manx runestone. The power of the kings of the Isles laid in their armed galley-fleets.