Henry VI of England ruled as king from 1422 to 1461 CE and again from 1470 to 1471 CE. Succeeding his father Henry V of England (r. 1413-1422 CE), Henry VI was crowned the king of France in 1431 CE but he could not prevent a French revival led by Charles VII of France (r. 1422-1461 CE) and such figures as Joan of Arc (c. 1412-1431 CE). The Hundred Years' War (1337-1453 CE) was ultimately lost and with it all England's territory in France except Calais. Back in England, the king's weakness of character and mind, and the intense rivalry between his barons led to the conflict known as the Wars of the Roses (1455-1487 CE) between the rival houses of Lancaster and York. After an episode of insanity, Henry VI had, in effect, a regent, Richard, the Duke of York in 1454 CE. Despite military victories by Henry's wife, Queen Margaret, the king was ultimately deposed by Richard's son Edward in 1461 CE. Henry would make a brief return to the throne in 1470 CE before Edward, now Edward IV of England (1461-1470 & 1471-1483 CE), was once more victorious on the battlefield and able to declare himself king for a second time. Henry was then murdered in the Tower of London in May 1471 CE.
Henry was born on 6 December 1421 CE in Windsor Castle, the son of Henry V of England and Catherine of Valois (l. 1401 - c. 1437 CE), the daughter of Charles VI of France. The reign of Henry's father was short but brilliant. Pressing his claim to the French throne, which had started with Edward III of England (r. 1327-1377 CE), Henry V had won a famous victory against a French army at the Battle of Agincourt in October 1415 CE and then conquered Normandy between 1417 and 1419 CE. This was to be the peak of English fortunes during the on-off conflict between the two countries known to history as the Hundred Years' War. The victories allowed Henry V to sign the 1420 CE treaty of Troyes with Charles VI of France (r. 1380-1422 CE) which made Henry the French king's heir while the blood heir, the Dauphin Charles, was disinherited. All this happened while France was split between two rival factions: the Burgundians and the Armagnacs.
The English barons would entangle themselves in a spiral of competition to see who could hold most power while Henry remained a minor.
Henry V died, probably of dysentery on 31 August 1422 CE at Bois de Vincennes in France. The English king had missed the chance to become the king of France by less than two months as Charles VI died on 21 October 1422 CE. Prince Henry, not even one year old, became the new king of England and the youngest to hold such a title before or since. He would not receive his coronation until 6 November 1429 CE in Westminster Abbey, officially becoming Henry VI of England. In the meantime, the infant had two regents, appointed by Henry V before his death: Humphrey, Duke of Gloucester (l. 1390-1447 CE) for England and John, Duke of Bedford (l. 1389-1435 CE) for the territories in France, where, at least according to the Treaty of Troyes, he was also now the king. Another important figure was the king's great-uncle, Henry Beaufort, Bishop of Winchester. These three men and others would entangle themselves in a spiral of competition to see who could hold most power while Henry remained a minor.
The Wars of the Roses were not over yet, though. Edward, the Duke of York's son, backed by the Earl of Warwick, was promoted as a replacement to his father and to King Henry. When Edward won the bloody Battle of Towton in March 1461 CE, the largest and longest battle in English history, this is indeed what transpired. Henry VI was deposed, and he, Queen Margaret, and their son Edward (b. 13 October 1453 CE) all fled to Scotland. Edward of York, just 19 years of age, was crowned Edward IV of England at Westminster Abbey on 28 June 1461 CE. Even this was still not the end of the civil war, merely a pause.