John married Baroness Margery De Badlesmere ROS, daughter of Baron Bartholomew De BADLESMERE and Margaret De CLARE, on 18 Oct 1363. (Baroness Margery De Badlesmere ROS was born about 1306 in Castle, Badlesmere, Kent, England and died before 22 Oct 1363 in Helmsley, Yorkshire, England.)