Patrick Gray was the son of Egidia Mercer and Gilbert Gray of Buttergask (half-brother of Patrick Gray, 3rd Lord Gray), and the grandson of Andrew Gray, 2nd Lord Gray (d. 1514). Patrick became Lord Gray in April 1541, after the death of his uncle. In order to succeed to the Gray lands, as heir of his grandfather, he had to pay 10,000 marks to the Treasury of King James V of Scotland, and was confirmed Lord Gray on 14 September 1542. He was still paying James Hamilton, Regent Arran, in 1543.Cameron, James V (Tuckwell, 1998), pp. 277–278.
