How had anselm marshell come to own chepstow castle?

Anselm Marshall acquired Chepstow Castle in the early 13th century through his marriage to the daughter of the previous owner, who was the lord of Chepstow. This union not only provided him with the castle but also elevated his status and influence in the region. His ownership marked a significant consolidation of power in the area during a time of political turmoil and shifting allegiances in medieval Wales.