forced to accept restricted them to Gwynedd Uwch Conwy, the part of Gwynedd west of the River Conwy, which was divided between them. Gwynedd Is Conwy, east of the river, was taken over by King Henry. When Dafydd ap Gruffydd came of age, King Henry accepted his homage and announced his intention to give him part of the already reduced Gwynedd. Llywelyn refused to accept this, and Owain and Dafydd formed an alliance against him. This led to the Battle of Bryn Derwin in June 1255. Llywelyn defeated Owain and Dafydd and captured them, thereby becoming sole ruler of Gwynedd Uwch Conwy. Llywelyn now looked to expand his area of control. The population of Gwynedd Is Conwy resented English rule. This area, also known as "Perfeddwlad" (meaning 'middle land') had been given by King Henry to his son Edward and during the summer of 1256, he visited the area, but failed to deal with grievances against the rule of his officers. An appeal was made to Llywelyn, who, that November, crossed the River Conwy with an army, accompanied by his brother, Dafydd, whom he had released from prison. By early December, Llywelyn controlled all of Gwynedd Is Conwy, apart from the royal castle at Dyserth, as a reward for his support and dispossessing his brother-in-law, Rhys Fychan, who supported the king. An English army led by Stephen Bauzan invaded to try to restore Rhys Fychan but was decisively defeated by Welsh forces at the Battle of Cadfan in June 1257, with Rhys having previously slipped away to make his peace with Llywelyn. Rhys Fychan now accepted Llywelyn as overlord, but this caused problems for Llywelyn, as Rhys's lands had already been given to Maredudd. Llywelyn restored his lands to Rhys, but the king's envoys approached Maredudd and offered him Rhys's lands if he would change sides. Maredudd paid homage to Henry in late 1257. By early 1258, Llywelyn was using the title Prince of Wales, first used in an agreement between Llywelyn and his supporters and the Scottish nobility associated with the Comyn family. The English Crown refused to recognise this title however, and, in 1263, Llywelyn's brother, Dafydd, went over to King Henry. On 12 December 1263, in the commote of Ystumanner, Gruffydd ap Gwenwynwyn did homage and swore fealty to Llywelyn. In return he was made a vassal lord and the lands taken from him by Llywelyn about