William de Mandeville, 3rd Earl of Essex

William de Mandeville III
Chief Justiciar of England
In office 1189 – 14 November 1189
Monarch	Richard I
Preceded by	Ranulf de Glanvill
Succeeded by	Hugh de Puiset
Personal details
Died	14 November 1189
Spouse(s)	Hawise, countess of Aumale
Children	none
Occupation	Earl of Essex Count of Aumale
Profession	Noble

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.

He 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 he 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 fall of 1178.

In 1180 he 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).

Earl 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. He carried the crown at the coronation of Richard I and held the favor of the new king. Richard I appointed him one of the two chief justiciars of England. But William died at Rouen a few months later on a mission to Normandy, without legitimate issue. He was buried at Mortemar Abbey in Normandy, founded by his Mandeville ancestors.

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