Sir Alexander de Cheyne was born circa 1248 at of Titeburste in Aldenham, Hertfordshire, England.1 He married Agnes de Say, daughter of Sir William de Say, Constable of Rochester Castle and Sibyl Marshal, circa 1268; They had 1 son, William.1 Sir Alexander de Cheyne died circa 22 May 1296 at of Keston, Kent, England.1
