Situated on the estuary of the Cleddau River, it became home to William Marshal, who had risen to become earl of Pembroke through his faithful service to the Plantagenet kings.
Saif ar foryd Afon Cleddau a ddaeth yn gartref i William Marshal, a oedd wedi esgyn i fod yn iarll Penfro o ganlyniad i'w wasanaeth ffyddlon i'r brenhinoedd Plantagenetaidd.