ca 1145 volgens
https://en.wikipedia.org/wiki/William_de_Beauchamp_(died_1260)#Early_life
1206-1207 volgens
https://en.wikipedia.org/wiki/William_de_Beauchamp_(died_1260)#Early_life
He is married to Isabelle.
They got marriedSource 1
https://www.oxforddnb.com/display/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-61192
Child(ren):