Another of the non-peerage titles belonging to the heir apparent, that of Lord of the Isles, merits special mention.
The Lords of the Isles, of the MacDonald family, originally functioned as vassals of the Scottish, or Norwegian, kings who ruled the Western Isles.
The ambitious John MacDonald II, fourth Lord of the Isles, made a secret treaty in 1462 with King Edward IV of England, by which he sought to make himself an independent ruler.

In 1475, James III discovered the Lord of the Isles' actions, and the Lordship became subject to forfeiture.
MacDonald later regained his position, but James IV again deprived him of his titles in 1493 after his nephew provoked a rebellion.
In 1540 James V of Scotland granted the Lordship to the heirs apparent to the Crown.
Another of the non-peerage titles belonging to the heir apparent, that of Lord of the Isles, merits special mention. The Lords of the Isles, of the MacDonald family, originally functioned as vassals of the Scottish, or Norwegian, kings who ruled the Western Isles. The ambitious John MacDonald II, fourth Lord of the Isles, made a secret treaty in 1462 with King Edward IV of England, by which he sought to make himself an independent ruler.
In 1475, James III discovered the Lord of the Isles' actions, and the Lordship became subject to forfeiture. MacDonald later regained his position, but James IV again deprived him of his titles in 1493 after his nephew provoked a rebellion. In 1540 James V of Scotland granted the Lordship to the heirs apparent to the Crown.
Duke of Rothesay