Gregory IX is elected pope. A compromise candidate, Pope Gregory IX immediately begins to make use of his power by placing Emperor Frederic II under a ban for not fulfilling his oath launch crusade to the Holy Land. The ban leads to excommunication and numerous threats.
Frederick II then will launch a conspiracy against Gregory who only narrowly escapes. Eventually Frederick will undertake his crusade and had himself crowned king of Jerusalem on March 18, 1229.
Pope Gregory IX will canonize a number of people who were important in the history of the Catholic Church, including Elizabeth, Dominic and Anthony of Padua, as well as Francis of Assisi, who had been a personal friend.