Walter de Sully
Walter was born about 1238 in Pembrokeshire, Wales.  He died in 1285.

 Mabel de Somery
Mabel was born about 1240.  She died in 1312.

 Sibil de Sully
Sibil was born about 1254 in Pembrokeshire, Wales.  She died before 1316 in England.

 Raymond de Sully
Raymond was born in 1272.  He died at the age of 45 in 1317.