955:

Teenager Becomes Pope

18-year-old Ottaviano, the only son of Duke Alberic II of Spoleto, who ruled Rome, became Pope John XII when his father ordered his election. John's pontificate lasted nine years, and he is said to have died in the arms of his mistress.

1431:

Henry VI of England crowned King of France

Though young Henry had been proclaimed king at age ten months, it was not til he was ten years old that he was officially crowned at Notre Dame Cathedral.

1485:

Catherine of Aragon

The first wife of King Henry VIII of England, Catherine was the daughter of Ferdinand and Isabella of Spain.