Benedict of Peterborough names "Hamelinus frater regis Henrici comes Warennæ" among those present at the coronation of King Richard I in 1189. Maybe Vicomte de Touraine. Earl of Surrey in 1164 by right of his wife.
"Hamelinus comes Guarennie" confirmed donations to Saint-Victor-en-Caux made by "Guillelmus de Guarenna et comes Guillelmus filius eius", for the soul of "uxoris mee Ysabel", by undated charter, witnessed by "Guillelmum de Guarenna filium meum…". An undated charter of ”Johannes comes Warennæ” confirmed earlier donations to Thetford Priory by “Hamelinus comes Warenniæ” with the consent of “Isabellæ comitissæ Warenniæ uxoris meæ et Willielmi de Warennia filii et hæredis mei”, for the souls of “Henrici regis fratris mei et Gaufridi comitis Andegaviæ patris mei”, witnessed by “Willilemus de Warennia filius Reginaldi de Warennia…”. “Hamelinus comes de Warenna” donated property to Slevesholm Priory, with the consent of “Ysabellæ comitissæ uxoris meæ et Willielmi filii nostri”, by undated charter. “Hamelinus comes de Warenna et Hysabella comitissa mea” donated property to St Mary Overey Priory, Southwark, for the souls of “Willielmi primi, secundi et tertii, et…Gundredæ comitissæ et Hisabellæ comitissæ”, by undated charter. Advocate of the abbey of Saint-Bertin: "Hamelin…comes de Waringe et ecclesie beati Bertini advocatus" donated land "in parochia de Rokesthorn" to Saint-Bertin, for "uxoris mee filiique mei Willelmi", by charter dated to [1182]. 1
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[Hamelin] was an illegitimate son of Geoffrey of Anjou, and thus a half-brother of King Henry II, and an uncle of King Richard I and of King John.
King Henry II arranged for him to marry one of the wealthiest heiresses in England, Isabel de Warenne, 4th Countess of Surrey, the widow of William of Blois... [After] the marriage he was recognized as Comte de Warenne, that being the customary designation for what more technically should be Earl of Surrey. In consequence of the marriage Hamelin adopted the surname de Warenne, as did his descendants...
Warenne's lands in England centred on Conisbrough Castle in Yorkshire, which powerful castle he built. He also possessed the "third penny" (an entitlement to one third of the fines levied in the county courts) of his County of Surrey and held the castles of Mortemer and Bellencombre in Normandy.
Hamelin joined in the denunciations of Archbishop of Canterbury Thomas Becket in 1164, although after Becket's death he became a great believer in Becket's sainthood, having reportedly been cured of blindness by the saint's intervention. In 1176 he escorted his niece Joan to Sicily for her marriage.
He remained loyal to Henry II through all the problems of the later part of his reign when many nobles deserted him, and continued as a close supporter of that king's eldest son and his own nephew, Richard I. During Richard's absence on the Third Crusade, he took the side of the regent William Longchamp. Hamelin was present at the second coronation of King Richard in 1194 and at King John's coronation in 1199. 2
Also known as Hamelin D' ANJOU and eventually as Hamelin DE WARENNE