English Aristocracy. Born the son of William de Warenne, 6th Earl of Surrey and his wife Matilda (Maud) Marshal. He was a boy when his father died, and for his minority Peter of Savoy, the Queen's brother, served as his guardian. In 1247 he married Alice de Luignan and with her had at least three children. He had at least an additional two acknowledged children born illegitimately. In 1254 he accompanied the future Edward I on his journey to Spain to marry Eleanor of Castile. During the unrest under Henry III, except for a brief period in 1262, he remained a strong supporter of the king. In 1264 he defended Rochester Castle against Simon de Montfort's forces, then repaired to his family seat at Lewes, where the royal army was defeated in May 1264 and de Warenne escaped to France. The following year he returned to England with Henry III’s half brother William de Valence and fought at the Battle of Evesham in August 1265, and the final defeat of de Montfort. De Warenne served in Edward I's Welsh campaigns in 1277, 1282, and 1283 and in 1282 was rewarded with the lordships of Bromfield and Yale in Wales. He accompanied the king on his invasion of Scotland in 1296 when the king appointed him warden of the kingdom and land of Scotland. The following spring began the rebellion led by William Wallace. de Warenne moved against him and was defeated at the Battle of Stirling Bridge. He led the next campaign against the Scots in early 1298 and raised the siege of Roxburgh, re-took the castle at Berwick, and served as one of the commanders at the Battle of Falkirk. He died at about 73 in Kennington, and was buried at Lewes Priory, Sussex. He was succeeded in his titles by his grandson, John.