Pope Pius V did not include the Saint's feast day in the Tridentine Calendar for use throughout the Roman Catholic Church. Subsequently, Pope Clement VIII inserted it, setting it for May 7, but Kraków observes it on May 8, a supposed date of the Saint's death, having done so since May 8, 1254, when it was attended by many Polish bishops and princes. In 1969, the Church moved the feast to April 11, considered to be the date of his death in 1079.