Dunstaffnage Castle () is a partially ruined castle in Argyll and Bute, western Scotland. It lies NNE of Oban, situated on a platform of conglomerate rock on a promontory at the south-west of the entrance to Loch Etive, and is surrounded on three sides by the sea. The castle and the nearby chapel ruin have been a Historic Scotland property since 1958. Both are Scheduled Ancient Monuments. The castle dates back to the 13th century, making it one of Scotland's oldest stone castles, in a local group which includes Castle Sween and Castle Tioram. Guarding a strategic location, it was built by the MacDougall lords of Lorn, and has been held since the 15th century by the Clan Campbell. To this day there is a hereditary Captain of Dunstaffnage, although they no longer reside at the castle. Dunstaffnage is maintained by Historic Environment Scotland, and is open to the public, although the 16th century gatehouse is retained as the private property of the Captain. The prefix dun in the name means "fort" in Gaelic, while the rest of the name derives from Norse stafr-nis, "headland of the staff". History Before Dunstaffnage Before the construction of the castle, Dunstaffnage may have been the location of a Dál Riatan stronghold, known as Dun Monaidh, as early as the 7th century. It was recorded, by John Monipennie in 1612, that the Stone of Destiny was kept here after being brought from Ireland, and before it was moved to Scone Palace in 843. However, Iona and Dunadd are considered more likely, given their known connections with Dál Riatan and Strathclyde kings. Hector Boece records that the stone was kept at "Evonium", which has traditionally been identified with Dunstaffnage, although in 2010 the writer A. J. Morton identified Evonium with Irvine in Ayrshire. The MacDougalls There was a castle here in the time of Somerled, Lord of the Isles. However, the castle became the seat of Duncan MacDougall, Lord of Lorn and grandson of Somerled in the second quarter of the 13th century. He had also travelled to Rome in 1237 and was the founder of nearby Ardchattan Priory. Duncan's son Ewen MacDougall inherited his father's title in the 1240s, and expanded the MacDougall influence, styling himself "King of the Isles" though that title belonged to the MacDonalds. It is probable that Ewen built the three round towers onto the castle, and constructed and enlarged