[1][2] As heir to his father, he was given sasine of his lands in 1491 as recorded by contemporary documents, the Munro Writs of Foulis.
[2] Sir William Munro was the king’s Lieutenant and Justicary of Inverness and the Earldom Ross.
He invaded Rosshire and was defeated in battle at Drumchatt by the Munros and Mackenzies, who were the king's allies.
Sir William Munro of Foulis was commissioned to let the King's lands of Lochaber and Mamore to "true men," as recorded in the Register of the Privy Seal of Scotland, 21 March 1501/02.
[8] Another historian from the early 18th century states that Munro was killed by Cameron, adding that: "the house was surrounded and refused to surrender".