Waleran III ( 1180–1193) was the eldest son and heir of Count Robert II of Meulan and co-ruler of the county of Meulan during his father's lifetime.Daniel Power, The Norman Frontier in the Twelfth and Early Thirteenth Centuries (Cambridge University Press, 2004), p. 509 (Meulan family tree).

Waleran was associated with his father in the sale of a mill to the in 1180.Étienne Deville, ed., Cartulaire de l'église de la Sainte-Trinité de Beaumont-le-Roger, publiée d'après le manuscrit original de la Bibliothèque Mazarine, avec introduction, notes, notices, appendices, tables (H. Champion, 1912), p. 203, doc. CCXLVI. In 1182 or 1183, his father associated him in the rule of Meulan and the lordship of Beaumont-le-Roger and handed over the castle of Meulan to him. He used the title "count and lord of the castle of Meulan".Holger Petersen Dyggve, "Personnages historiques figurant dans la poésie lyrique française des XIIe et XIIIe siècles", Neuphilologische Mitteilungen 45.2 (1944), p. 88: "". He also named him as his heir in those lands while reserving other lands for his other children.David Crouch, "Testament and Inheritance: The Lessons of the Brief Widowhood of Isabel, Countess of Pembroke", in Travis R. Baker, ed., Law and Society in Later Medieval England and Ireland: Essays in Honour of Paul Brand (Routledge, 2017), p. 42.

Waleran's marriage to Margaret, daughter of , was negotiated at Mortain in 1189. The negotiations brought together many of the leading men of the Duchy of Normandy to stand as pledges or sureties for the nuptial contract.Daniel Power, The Norman Frontier in the Twelfth and Early Thirteenth Centuries (Cambridge University Press, 2004), pp. 240, 251–252. In a subsequent act, Robert, in preparation to go on crusade, bestowed all his lands on Waleran as his universal heir, reserving only his right to bequeath lands to his other children.Étienne Deville, ed., Cartulaire de l'église de la Sainte-Trinité de Beaumont-le-Roger, publiée d'après le manuscrit original de la Bibliothèque Mazarine, avec introduction, notes, notices, appendices, tables (H. Champion, 1912), p. 214, doc. CCLXI. Waleran and Margaret had a son named Ralph, who became the lord of Courseulles-sur-Mer and was still living in 1266.Daniel Power, The Norman Frontier in the Twelfth and Early Thirteenth Centuries (Cambridge University Press, 2004), p. 499 (Fougères family tree).

With his father, Waleran joined Richard I of England on the Third Crusade (1190–1191).Holger Petersen Dyggve, "Personnages historiques figurant dans la poésie lyrique française des XIIe et XIIIe siècles", Neuphilologische Mitteilungen 45.2 (1944), p. 89. According to some sources, he died in battle against the Seljuk Turks.Daniel Power, The Norman Frontier in the Twelfth and Early Thirteenth Centuries (Cambridge University Press, 2004), p. 405. In the romance Foulques de Candie, he is depicted dying in single combat against a Saracen leader. In 1193–1194, however, he is recorded at Mortain as a witness to an act of Count John Lackland. He predeceased his father.F. M. Powicke, The Loss of Normandy, 1189–1204: Studies in the History of the Angevin Empire (Manchester University Press, 1913), p. 503, says he was killed on a pilgrimage. He probably died around 1197.

Margaret of Fougères outlived her husband, dying in 1209. She may be the old mentioned in the song by the trouvère Renaut de Sabloeil.Holger Petersen Dyggve, "Personnages historiques figurant dans la poésie lyrique française des XIIe et XIIIe siècles", Neuphilologische Mitteilungen 45.2 (1944), p. 91, dates this song to the 1230s.

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