Gylen Castle is a very small castle, or tower house, at the south end of the island of Kerrera in Argyll and Bute, Scotland, on a promontory overlooking the Firth of Lorne. It was made a scheduled monument in 1931.HistoryBuilt in 1582 by the Clan MacDougall. Gylen was only occupied for a relatively short time. The castle was besieged then burned by the Covenanters under General Leslie in 1647 during the Wars of the Three Kingdoms.In May 2006 a partial restoration of the castle was completed with a £300,000 grant by Historic Scotland and £200,000 raised by worldwide members of Clan MacDougall.