312 Constantine the Great is said to have received his famous Vision of the Cross.
939 Athelstan died. Athelstan was the first West Saxon king to have effective rule over the whole of England. He was succeeded by Edmund I as King of England.
1401 Catherine of Valois was born. The neglected daughter of King Charles VI of France, Catherine married King Henry V of England and gave birth to his son, Henry VI. After her husband's untimely death, she began a relationship with Owen Tudor, and married him in secret. One of their sons was the father of King Henry VII.