April 23:
A.D. 1014: King Brian Boru of Ireland defeats invading Danes at the Battle of Clontarf.
A.D. 1154: Damascus surrenders to Sultan Nur ad-Din van Aleppo.
A.D. 1635: The first public institution in the U.S., Boston Latin School, is founded.
A.D. 1941: The Greek army surrenders to German Nazis. King George II escapes to Egypt.