Title: William de Mandeville, 3rd Earl of Essex
Content: This page refers to the 12th-century 3rd Earl of the first creation. For the 13th-century 3rd Earl of the second creation see William FitzGeoffrey de Mandeville, 3rd Earl of Essex.  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 
Title: William FitzGeoffrey de Mandeville, 3rd Earl of Essex
Content: This page refers to the 13th-century 3rd Earl of the second creation. For the 12th-century 3rd Earl of the first creation see William de Mandeville, 3rd Earl of Essex.  William FitzGeoffrey de Mandeville (died 1227) was the third Earl of Essex of the second creation from either 1219 or 1216 AD. to his death. He was the second son of Geoffrey Fitz Peter and Beatrice de Say and he succeeded his elder brother Geoffrey FitzGeoffrey as earl and inheritor of the Mandeville earldom and barony. His brother had been a Magna Charta Surety and he was also an ardent supporter of the baronial 
Title: William de Mandeville
Content: For the councillor of Henry II, the crusading earl of Essex, see William de Mandeville, 3rd Earl of Essex.  William de Mandeville (died before 1130) was an Anglo-Norman baron and Constable of the Tower of London.
Title: Earl of Essex
Content: Geoffrey de Mandeville, 1st Earl of Essex (died 1144) ; Geoffrey de Mandeville, 2nd Earl of Essex (died 1166) ; William de Mandeville, 3rd Earl of Essex (died 1189) (extinct) 
Title: Earl of Essex
Content: Geoffrey Fitzpeter, 1st Earl of Essex (died 1213) ; Arms of William de Mandeville (d. 1227).svgrey FitzGeoffrey de Mandeville, 2nd Earl of Essex (died 1216) ; William FitzGeoffrey de Mandeville, 3rd Earl of Essex (died 1227) (extinct) 
Title: William de Mandeville, 3rd Earl of Essex
Content:  to the vast Mandeville estate was William's elderly aunt, Beatrice de Say, née Mandeville, who surrendered her claim to her second but surviving son, Geoffrey de Say. Geoffrey contracted to pay an unprecedentedly large relief for the Mandeville inheritance, but he rapidly fell into arrears. Geoffrey Fitz Peter, the husband of Beatrice's granddaughter and namesake, Beatrice de Say, was a prominent man at court and used his position to push his wife's claim. She was the eldest daughter of William de Say, Geoffrey's elder but deceased brother, William de Say. The king awarded the Mandeville estates and, eventually, the earldom of Essex to Geoffrey Fitz Peter by right of his wife.
Title: Geoffrey de Mandeville, 2nd Earl of Essex
Content:  Geoffrey de Mandeville, 2nd Earl of Essex (d 1166) was an English nobleman, the second son of Geoffrey de Mandeville, 1st Earl of Essex and Rohese de Vere, Countess of Essex.
Title: William de Mandeville
Content: Geoffrey de Mandeville, 1st Earl of Essex (d. 1144) ; Beatrice de Mandeville (d. 19 Apr. 1197), married William de Say (d. Aug. 1144). Their granddaughter Beatrice de Say took some of the Mandeville inheritance to her husband, Geoffrey fitz Peter. 
Title: Geoffrey FitzGeoffrey de Mandeville, 2nd Earl of Essex
Content:  Geoffrey de Mandeville, 2nd Earl of Essex and 4th Earl of Gloucester (c. 1191 – 23 February 1216) was an English peer. He was an opponent of King John and one of the Magna Carta sureties. Geoffrey and his brother took the surname Mandeville because of the lineage of their mother, Beatrice de Say, who was a granddaughter of Beatrice de Mandeville, the sister of Geoffrey de Mandeville, Earl of Essex (d. 1144). The elder Beatrice inherited the Mandeville honor in 1189, on the death of her nephew William de Mandeville, 3rd Earl of Essex. Richard I of England allowed her lands and the earldom to pass to her granddaughter's husband Geoffrey fitz Peter. Their eldest son Geoffrey inherited the earldom of Essex from his father in 1213. 
Title: Earl of Essex
Content:  The title was first created in the 12th century for Geoffrey de Mandeville, 1st Earl of Essex (died 1144). Upon the death of the third earl in 1189, the title became dormant or extinct. Geoffrey Fitz Peter, who had married Beatrice de Say, granddaughter of the first earl's sister and eventual heir to the Mandeville honour, gained the earldom in 1199 at its second creation by King John. The Essex title passed to two of Fitz Peter's sons before again becoming extinct upon the death of the second son, William, the 3rd Earl of Essex, who had taken the surname de Mandeville. The third creation was for Humphrey de Bohun, 2nd Earl of Hereford in 1239, whose father Henry had married Maud, sister of the sixth 

Question: Who is the father of William de Mandeville, 3rd Earl of Essex?
Answer: Geoffrey de Mandeville, 1st Earl of Essex.