As pope he endeavoured, but without success, to stir up a new crusade on behalf of his former diocese of Jerusalem. In domestic matters the chief problems of his pontificate arose out of the competing claims for the crown of the Two Sicilies. Before the arrival of Charles of Anjou, the candidate whom he favoured, Urban died at Perugia on 2nd October 1264. His successor was Clement IV. The festival of Corpus Christi ("the Body of Christ") was instituted by Urban IV in 1264.
from the 9th edition (1880) of an unnnamed encyclopedia
Pope Alexander IV
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Pope Clement IV