William de Montague , Sir Knight
William was born in 1215 in Shepton, Somerset, England.  He died at the age of 55 on September 23rd, 1270.

 Berthe
Berthe was born about 1235.

 Isabella de Montague
Isabella was born about 1255 in Cossington, Somersetshire, England.  She died after 1280 in Cossington, Somersetshire, England.

 Simon de Montague , 1st Baron Montagu
Simon was born about 1269 in Somersetshire, England.  He died on September 26th, 1316 in England.