John Lyon, 1st Thane of Glamis

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Sir John Lyon, Thane of Glamis, jure uxoris Thane of Tannadyce (c.1340-1382), son of John de Lyon, feudal Baron of Forteviot, was Chamberlain of Scotland between 1377 and 1382.

Sir John is widely accepted as being the progenitor of Clan Lyon, a claim verfified by renowned historian Sir Ian Moncreiffe of that Ilk, Bart. His origins were french, his surname being an anglicised version of the gallic de Leon.

He married Princess Joanna, daughter of Robert II, who granted him his title. The Princess was the widow of Sir John Keith.