1. King Henry VI

Age at accession: 8 months, 25 days

Reign: 1422–1461 and 1470–1471

This King Henry also had LINK one of the longest reigns of any English monarch. His father was Henry V. Even though young Henry became king when his father died, young Henry was essentially provided for by a regency council until young Henry wasn’t so young. While he was king, the country lost much of the French territory won by Henry V (including a string of victories spurred by the spirited Joan of Arc) and then descended into the Wars of the Roses, the civil war that tore the country apart for more than two decades. Henry VI was actually king twice. At the end of his second reign, he was imprisoned in the Tower of London, where he died.