Henry de Percy, 2nd Baron Percy, who was granted the lands of Patrick IV, Earl of March, in Northumberland, by Edward II in 1316, began to improve the size and defences of the castle. He was appointed to Edward III's Council in 1327 and was given the manor and castle of Skipton. Was granted, by Edward III, the castle and barony of Warkworth in 1328. He was at the siege of Dunbar and the Battle of Halidon Hill and was subsequently appointed constable of Berwick-upon-Tweed. In 1346, Henry commanded the right wing of the English Army which defeated a larger Scottish force at the Battle of Neville's Cross. His son, Henry de Percy, 3rd Baron Percy married Mary of Lancaster, an aunt of John of Gaunt's wife Blanche of Lancaster.