This Day in History: 0000-03-31

31 Mar – Bernard of Clairvaux preached his sermon at Vezelay, calling Christians to arms in the Second Crusade (1146).
31 Mar – Japanese invade and conquer Christmas Island in the Indian Ocean from the United Kingdom (1942).
31 Mar – Wrestlemania, the largest wrestling event in the World Wrestling Federation, began in Madison Square Garden (1985).