Birlinn in the context of "Norse-Gaels"

The Irish galley was a vessel in use in the West of Ireland down to the seventeenth century, and was propelled both by oars and sail. In fundamental respects it resembled the Scottish galley or bìrlinn, their mutual ancestor being the Viking longship. Both the Irish and Scottish versions were colloquially known as "longa fada" (longships). The Irish galley was commonly an eight or twelve-oared vessel and was used for both warfare and trade. It was notable for its speed when rowed.

Conventional galleys were being built in a number of Irish ports in the fourteenth century, and were even commissioned by the English Crown. The use of such oared vessels in Northern Europe, in contrast to the Mediterranean, had greatly declined by the sixteenth century; their survival in the west of Ireland, as in the Scottish Isles, was facilitated by very local conditions, among them the ready availability of bays and islands.

Lord of the Isles or King of the Isles (Scottish Gaelic: Triath nan Eilean or Rìgh Innse Gall; Latin: Dominus Insularum) is a title of nobility in the Baronage of Scotland with historical roots that go back beyond the Kingdom of Scotland. It began with Somerled in the 12th century and thereafter the title was held by a series of his descendants, the Norse-Gaelic rulers of the Isle of Man and Argyll and the islands of Scotland in the Middle Ages. They wielded sea-power with fleets of galleys (birlinns). Although they were, at times, nominal vassals of the kings of Norway, Ireland, or Scotland, the island chiefs remained functionally independent for many centuries. Their territory included much of Argyll, the Isles of Arran, Bute, Islay, the Isle of Man, Hebrides (Skye and Ross from 1438), Knoydart, Ardnamurchan, and the Kintyre peninsula. At their height they were the greatest landowners and most powerful lords after the kings of England and Scotland.

The end of the MacDonald Lords came in 1493 when John MacDonald II had his ancestral homeland, estates, and titles seized by King James IV of Scotland. After that time, the MacDonald Clan contested the right of James IV to the Lordship of the Isles and uprisings and rebellions against the Scottish monarch were common. More recently, the Lordship of the Isles has been held by the Duke of Rothesay, the eldest son and heir apparent of the King of Scots, a title which, since the creation of the Kingdom of Great Britain, is usually borne by the Prince of Wales. Thus Prince William is the current Lord of the Isles.