Seagate Castle Treaty of Irvine signed in the old castle 9th July 1297. Mary Queen of Scots, with her "four Maries" Mary Beaton, Mary Seaton, Mary Fleming & Mary Livingstone visited the castle, 1st August 1563 and was entertained by Hugh, 3rd Earl of Eglinton, one of her most faithful adherents. "I was the Queen o' bonnie France and I'm the sovereign of Scotland."