http://www.archive.org/stream/cu31924084250582#page/n194/mode/1up
See Footnote
In 1233 the king had given him Margaret de Stuteville as wife
(evidently she was a minor and died young).
William was given seizin on the lands of Margaret's father, as one co-
heiress, so he was an adult, and living and the king's relative...
I have no "de Mastac's" in my database. Who was he?
Will