William married Joan Greystoke in 1414 in Of, Owesley, Yorkshire, England. Joan (daughter of Ralph Greystoke, [BARON GREYSTOKE and Catherine Clifford, [BARONESS GREYST) was born about 1395 in Of, GREYSTOKE, Cumberland, England; died in 1415 in Of, , Durham, England; was buried in Of, , Durham, England. [Group Sheet] [Family Chart]