Henry I (circa 1068 – 1 December 1135) was the third son of William the Conqueror and the first born in England after the Norman Conquest of 1066. He succeeded his elder brother William II as King of England in 1100 and defeated his eldest brother, Robert Curthose, to become Duke of Normandy in 1106. He was called Beauclerc for his scholarly interests and Lion of Justice for refinements which he brought about in the rudimentary administrative and legislative machinery of the time.