The young Henry played an important part in the politics of his father's reign. On 2 November 1160, he was betrothed to Margaret of France, daughter of King Louis VII of France and his second wife, Constance of Castile, when he was 5 years of age and she was at least 2. The marriage was an attempt to finally settle the struggle between the counts of Anjou and the French kings over possession of the frontier district of the Norman Vexin, which Louis VII had acquired from Henry's grandfather, Geoffrey Plantagenet, Count of Anjou, in around 1144. By the terms of the settlement, Margaret would bring the castles of the Norman Vexin to her new husband. However, the marriage was pushed through by Henry II when Young Henry and Margaret were small children so that he could seize the castles. A bitter border war followed between the kings.