Achadun castle is not as ruined as Ardtornish castle, not as restored as Gylen, and certainly not as complete as Dunstaffnage – but it is in a pleasing position above the bays giving the two anchorages protected from all wind directions between them, no doubt a consideration to those who put the castle there in the first place. But these early builders would not have had their view up Loch Linnhe ruined by the Glensanda quarry. It dates from the 13th Century and was built by the bishops of Argyll in the days when bishops needed to defend themselves, from what I know not. But then these days it is thought the MacDougalls built it and only later did the Bishops take it over.