The Battle of Bloody Bay, or Blàr Bàgh na Fala in Scottish Gaelic, was a naval battle fought near Tobermory, Scotland. It was fought on the coast of Mull two miles north of Tobermory, between John of Islay, Earl of Ross, the Lord of the Isles and chief of Clan Donald; and his son, Angus Og Macdonald. The precise date of the battle varies in sources, from 1480 to 1483. After the battle, in which Angus Og Macdonald emerged victorious, the latter seized power from his father, and held it for a decade. However, Angus's victory would prove pyrrhic. Many clansmen had died in the battle and nearly half the clan's fleet had been sunk, as a result of which the power of the Lords of the Isles was henceforth greatly diminished.