He was a son of William de Londres (died 1131), who was one of the Twelve Knights of Glamorgan, and his wife Matilda.
During the Welsh uprising, after the death of King Henry I, he made a counter-attack after the defeat of the Anglo-Normans at the Battle of Loughor.
[5] He also founded Ewenny Priory in 1141 when he granted the nearby Norman church of St. Michael to the abbey of St. Peter at Gloucester (now Gloucester Cathedral), together with the churches of St Brides Major, St. Michael at Colwinston and the manor at Lampha.
In around 1159 he lost control of Kidwelly to Rhys ap Gruffydd, the Welsh prince of Deheubarth.
With his wife Adeliza, he had two sons, William de Londres (died 1211) and Thomas.