Hugh de Vivonia
Hugh was born in 1195.  He died before 1249.

 Mabel Malet
Mabel was born in 1199 in Curry Malet, Somersetshire, England.

 William le Forte de Fortibus de Vivonia
William le Forte de Fortibus was born about 1219 in Albermarle, Scotland.  He died on May 22nd, 1259.