Where was the castle located in which is related to William Douglas and Margaret Hay?
George Douglas, 4th Earl of Angus: George Douglas, 4th Earl of Angus, Lord Douglas, Abernethy and Jedburgh Forest (c. 1427 – 12 March 1463) was a Scottish nobleman. George Douglas, 4th Earl of Angus:  He was the son of William Douglas, 2nd Earl of Angus and Margaret Hay of Yester.
i don't know