[ScG Dùn Ollaigh].
A rocky peninsula, 80 feet high, to the north of Oban harbour, north Strathclyde (until 1974, Argyllshire), site of a fortress during the heyday of the Gaelic kingdom of Dál Riada from the 5th to 8th centuries. The site may also have contained a Celtic hill-fort from an earlier period. Chronicles testify that it was burned by enemies in 686 and 698, sacked in 701, and replaced by major refortifications in 714. Remains of a castle begun in the 13th century also still stand. Dunollie was also the seat of the Clan MacDougall.