William De Montacute Earl of Salisbury
William De Montacute Earl of was born in 1234.  He died at the age of 54 in 1288.

 Bertha (Montacute)
Bertha was born in 1236.  Bertha is no longer alive.

 Simon de Montacute I Baron Montacute
Simon de Montacute I Baron was born in 1255 in Montacute, Somersetshire, England.  He died at the age of 61 on September 26th, 1316 in Priory, Burton, Somersetshire, England.

 John De Montacute
John was born in 1256.  He died at the age of 34 in 1290.