Baderon confirmed the possessions of the Priory at Monmouth granted by his predecessors, and extended them.
His sister Margaret, whose son Robert became prior of Monmouth, and whose second husband, Hugh fitzRichard, was a landowner in Worcestershire, made further grants of land to the priory.
[2] At some point after 1130 Baderon married Rohese (or Rohesia), the daughter of Gilbert fitzRichard de Clare, and the sister of Gilbert de Clare, who was the lord of Striguil (or Chepstow) and later became Earl of Pembroke.
The marriage took place at Chepstow, and brought together the families of the two neighbouring, and sometimes rival, lordships.
He was a contemporary and possible kinsman of Geoffrey of Monmouth, who was born in the same town at around the same date.