John married Margaret De Vere, [BARONESS BEAUMO about 1375. Margaret (daughter of John De Vere, [EARL OF OXFORD] and Maud De Badlesmere, [COUNTESS OF OXF) was born about 1344 in ; died on 15 Jun 1398 in Grey Friars, London, Middlesex, England; was buried in Grey Friars, Newgate, , England. [Group Sheet] [Family Chart]