April 2:
A.D. 999: Gerbert of Aurillac is elected as Pope--the first from France.
A.D. 1453: Sultan Mehmet II begins his siege of Constantinople, which is the first successful one on the city.
A.D. 1800: The first performance of Beethoven's first symphony.
A.D. 1902: The first movie theatre opens (in Los Angeles).