Henry V was King of England from 1413 until his death at the age of 36 in 1422. He was the second English monarch who came from the House of Lancaster.
After military experience fighting the Welsh during the revolt of Owain Glyndŵr, and against the powerful aristocratic Percys of Northumberland at the Battle of Shrewsbury, Henry came into political conflict with his father, whose health was increasingly precarious from 1405 onward. After his father's death in 1413, Henry assumed control of the country and embarked on war with France in the ongoing Hundred Years' War (1337–1453) between the two nations. His military successes culminated in his famous victory at the Battle of Agincourt (1415) and saw him come close to conquering France. After months of negotiation with Charles VI of France, the Treaty of Troyes (1420) recognised Henry V as regent and heir apparent to the French throne, and he was subsequently married to Charles's daughter, Catherine of Valois (1401–37). Following Henry V's sudden and unexpected death in France two years later, he was succeeded by his infant son, who reigned as Henry VI (1422–61, 1470–71).
The Royal style of King Henry V was "Rex Angliae et Franciae et Dominus Hiberniae" (King of England and of France and Lord of Ireland) to 1420, then "Rex Angliae, Haeres et Regens Franciae, et Dominus Hiberniae" (King of England, Heir and Regent of France and Lord of Ireland).