 Hostilities broke out with William Marshal, 2nd Earl of Pembroke, in 1220.Llywelyn destroyed the castles of Narberth and Wiston, burnt the town of Haverfordwest and threatened Pembroke Castle, but agreed to abandon the attack on payment of £100.In early 1223, Llywelyn crossed the border into Shropshire and captured Kinnerley and Whittington castles.