William de Mandeville, 3rd Earl of Essex
Councillor of Henry II and Richard I of England and crusader

William de Mandeville, 3rd Earl of Essex (1st Creation) (died 14 November 1189) was a loyal councillor of Henry II and Richard I of England.
William was the second son of Geoffrey de Mandeville, 1st Earl of Essex and Rohese de Vere, Countess of Essex. After his father's death while in rebellion (1144), William grew up at the court of the Count of Flanders. On the death of his elder brother Geoffrey late in 1166, he returned to England and became Earl of Essex, where he spent much time at the court of Henry II. He stayed loyal to the king during the Revolt of 1173–1174, known as the Revolt of the Young King.
In 1177 William became a crusader, in company with Count Philip of Flanders. Philip attempted to intervene in the court politics of the Kingdom of Jerusalem but was rebuffed, and the two fought for the Principality of Antioch at the siege of Harim. William returned to England in the autumn of 1178.
In 1180 William married Hawise, daughter and heiress of William, Count of Aumale, a major Yorkshire lord, who had died the previous year. Earl William gained possession of her lands, both in Normandy and in England, along with the title of Count of Aumale (or Earl of Albemarle as it is sometimes called).
William fought in the wars against the French toward the end of Henry II's reign, and was at the deathbed of that king in 1189.
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