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Richard I (8 September 1157 – 6 April 1199), known as Richard Cœur de Lion (Norman French: Quor de Lion) or Richard the Lionheart because of his reputation as a great military leader and warrior, was King of England from 1189 until his death in 1199. He also ruled as Duke of Normandy, Aquitaine, and Gascony; Lord of Cyprus; Count of Poitiers, Anjou, Maine, and Nantes; and was overlord of Brittany at various times during the same period. He was the third of five sons of Henry II of England and Eleanor of Aquitaine and was therefore not expected to become king, but his two elder brothers predeceased their father.

By the age of 16, Richard had taken command of his own army, putting down rebellions in Poitou against his father. Richard was an important Christian commander during the Third Crusade, leading the campaign after the departure of Philip II of France and achieving several victories against his Muslim counterpart, Saladin, although he finalised a peace treaty and ended the campaign without retaking Jerusalem.

Richard probably spoke both French and Occitan. He was born in England, where he spent his childhood; before becoming king, however, he lived most of his adult life in the Duchy of Aquitaine, in the southwest of France. Following his accession, he spent very little time, perhaps as little as six months, in England. Most of his reign was spent on Crusade, in captivity, or actively defending the French portions of the Angevin Empire. Though regarded as a model king during the four centuries after his death, and seen as a pious hero by his subjects, from the 17th century onward he was gradually perceived by historians as a ruler who preferred to use his kingdom merely as a source of revenue to support his armies, rather than regarding England as a responsibility requiring his presence as ruler. This "Little England" view of Richard has come under increasing scrutiny by modern historians, who view it as anachronistic. Richard I remains one of the few kings of England remembered more commonly by his epithet than his regnal number, and is an enduring iconic figure both in England and in France.