William married Elizabeth De Ros, [BARONESS ZOUCHE before 16 Jul 1334 in Of, Harringworth, Northampton, England. Elizabeth (daughter of William De Ros, [BARON ROS] and Margery De Badlesmere, [BARONESS ROS]) was born about 1325 in Of, Helmsley, Yorkshire, England; died after 16 May 1380 in Of, Harringworth, Northamptonshire, England. [Group Sheet] [Family Chart]