May 4, 1471 - The Yorkists, lead by Edward IV, defeat the Lancastrians at the Battle of Tewkesbury. This was the battle that effectively ended the Wars of the Roses (though most will say Henry VII did that by marrying Elizabeth of York). Edward, Prince of Wales, Henry VI and Margaret of Anjou's only child, was killed at the battle and is buried at Tewkesbury Abbey in Gloucester.
May 4, 1776 - Rhode Island becomes the first colony to renounce allegiance to King George III.
May 4, 1942 - The Battle of the Coral Sea began when the USS Yorktown attacked Japanese forces on the island of Tulagi.