On 21 October 1545, Hugh's second son John wrote to the Queen Dowager, Mary of Guise from Cowthally Castle.
James Somerville wrote to Queen Regent of Scotland, Mary of Guise, from Cowthally Castle on 22 March 1554.
The historian only found one charter signed by John at Edinburgh in 1510 connected with his coming-of-age, and assumes the Lord spent most of his life at Cowthally Castle near Carnwath.
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