place in the autumn, a lasting civil war was avoided through the mediation of the Archbishops Philip of Esztergom and Smaragd of Kalocsa who persuaded Béla and his son to make a compromise. According to the Peace of Pressburg, the two divided the country along the Danube: the lands to the west of the river remained under the direct rule of Béla, and the government of the eastern territories was taken over by Stephen, the king-junior. The relationship between father and son remained tense. Stephen seized his mother's and sister's estates which were situated in his realm to the east of the Danube. Béla's army under Anna's command crossed the Danube in the summer of 1264. She occupied Sárospatak and captured Stephen's wife and children. A detachment of the royal army, under the command of Béla's Judge royal Lawrence forced Stephen to retreat as far as the fortress at Feketehalom (Codlea, Romania) in the easternmost corner of Transylvania. The king-junior's partisans relieved the castle and he started a counter-attack in the autumn. In the decisive Battle of Isaszeg, he routed his father's army in March 1265. It was again the two archbishops who conducted the negotiations between Béla and his son. Their agreement was signed in the Dominican Monastery of the Blessed Virgin on Rabbits' Island (Margaret Island, Budapest) on 23 March 1266. The new treaty confirmed the division of the country along the Danube and regulated many aspects of the co-existence of Béla's regnum and Stephen's regimen, including the collection of taxes and the commoners' right to free movement. Last years (1266–70) The "nobles of all Hungary, who are called servientes regis" from both the senior and the junior king's domains assembled in Esztergom in 1267. Upon their request, Béla and Stephen jointly confirmed their privileges, which had first been spelled out in the Golden Bull of 1222, before 7 September. Shortly after the meeting, Béla assigned four noblemen from each county with the task of revising property rights in Transdanubia. King Stephen Uroš I of Serbia invaded the Banate of Macsó, a region under the rule of Béla's widowed daughter, Anna. A royal army soon routed the invaders and captured Stephen Uroš. The Serbian monarch was forced to pay ransom before being released. Béla's favorite son, also named Béla, died in the summer of 1269. On 18 January 1270 the King's youngest daughter, the saintly Margaret, also died.