George attempted to secure peace with Rome by a radical suggestion, which some consider to have been a proposal before its time of a European Union. He proposed a treaty among all Christian powers, with Hungary, Poland, Bohemia, Bavaria, France, and Italian states and its princes the founding members, but others, especially the Hispanic powers, joining later. The member states would pledge to settle all differences by exclusively peaceful means. There was to be a common parliament and other common institutions. George couched the proposal in Christian terms ("Europe" is not explicitly mentioned) as a way to stop the "abominable Turk", who had conquered Constantinople in 1453.