The eventful Avignon Papacy included three different popes ruling at the same time and an Irish king complaining about the ...
March 27 – The death of Pope Gregory XI leads to a crisis. The election of Pope Urban VI is disputed, and a faction of cardinals elects Antipope Clement VII, triggering the Western Schism ...
It was introduced into the Roman Catholic Church in the 15th century by Pope Gregory XI, then removed from the calendar by Pope Pius V in the mid 16th century. Pope Sixtus V later reestablished ...