Background
Cokayne was the fourth son of George Cokayne (originally George Adams), author of The Complete Peerage, the son of William Adams and his second wife Mary Anne, granddaughter of Charles Cokayne, 5th Viscount Cullen.
Cokayne was the fourth son of George Cokayne (originally George Adams), author of The Complete Peerage, the son of William Adams and his second wife Mary Anne, granddaughter of Charles Cokayne, 5th Viscount Cullen.
He was educated at Charterhouse School. Created a Knight Commander of the Order of the British Empire in 1917, in 1920 he was raised to the peerage as Baron Cullen of Ashbourne, of Roehampton in the County of Surrey, a revival of the Cullen title held by his paternal ancestors. Lord Cullen of Ashbourne married Grace Margaret, daughter of Reverend the Honorary
John Marsham, in 1904.