Every four years, a day is added to the calendar, but why? How and when did humans decide it was necessary? Did you know the calendar will eventually need to change again?
Gregory XIII pope from 1572 to 1585, who promulgated the Gregorian calendar and founded a system of seminaries for Roman Catholic priests. Educated at the University of Bologna, he taught jurisprudence there from 1531 to 1539. Because of his expertise in canon law, he was sent by Pope Pius IV in
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