In 1198, King Henry II of England invaded Ireland and gave the part of it he controlled to his son John as a Lordship when John was just 10 in 1177. When John succeeded to the English throne in 1199, he remained Lord of Ireland thereby bringing the kingdom of England and the lordship of Ireland into personal union. Successive Kings of England also had the title of Lord of Ireland until the title was abolished by Henry VIII, who was made King of Ireland by the Parliament of Ireland by the Crown of Ireland Act 1542.
Henry VI was King of England from 1422 to 1461 and again from 1470 to 1471, and disputed King of France from 1422 to 1453. The only child of Henry V, he succeeded to the English throne at the age of nine months upon his father's death, and succeeded to the French throne on the death of his grandfather Charles VI shortly afterwards. Henry inherited the long-running Hundred Years War (1337-1453) where Charles VII contested his claim to the French throne. Henry married Charles's niece, Margaret of Anjou, partially in the hope of achieving peace in 1445, but the policy failed, leading to the murder of William de la Pole, one of Henry's key advisors. The war recommenced, with France taking the upper hand; by 1453, Calais was Henry's only remaining territory on the continent.
The Royal style of King Henry VI was"Rex Angliae, Haeres et Regens Franciae, et Dominus Hiberniae" (King of England, Heir and Regent of France and Lord of Ireland) to 1422, then "Rex Angliae et Franciae et Dominus Hiberniae" (King of England and of France and Lord of Ireland).