Tibbers Castle led to a succession crisis resulting in English rule of Scotland under Edward I. Robert the Bruce's family was one of the claimants and in 1306 he was crowned king, leading to war with England. The first phase of Bruce's campaign in 1306 was to capture the English-held castles of Ayr, Dalswinton, Inverkip and Tibbers. Control was given to John de Seton until the English recaptured the castle from the Scots, hanging the defenders, and a larger garrison, this time numbering 54, was installed. In 1313 the Scots regained control of the region. From there Tibbers Castle remained in Scottish
Edward III of England king in London on 25 January 1327. The new king was crowned as Edward III on 1 February at the age of 14. It was not long before the new reign also met with other problems caused by the central position at court of Roger Mortimer, who was now the "de facto" ruler of England. Mortimer used his power to acquire noble estates and titles, and his unpopularity grew with the humiliating defeat by the Scots at the Battle of Stanhope Park and the ensuing Treaty of Edinburgh–Northampton, signed with the Scots in 1328. Also the young king came into