In 1260, Queen Margaret had released Archbishop Erlandsen from prison thinking he would be grateful, but he subsequently issued an interdict over all of Denmark trying to force the Queen and her son, King Eric off the throne. In 1263, acting as regent of Denmark, the Queen wrote to Pope Urban IV asking him to intervene with Archbishop Erlandsen. After several years of quibbling, the Pope agreed to several items that the Queen wanted. He issued a dispensation to alter the terms of the Danish succession that would permit women to inherit the Danish throne. This would make it possible for one of King Eric's sisters to become the reigning Queen of Denmark in the event of his death, because he had no children. Although Pope Urban IV gave his consent, it never became an issue. King Eric's son, Prince Eric Menved, eventually succeeded to the Danish throne.