Family
 William de Warenne, 5th Earl of SurreyDied 1240 Notes: Alice, Countess of Eu can be confirmed as William's niece - therefore Alice's mother must be a sister of William. Married 13 Oct 1225 (14 or 15 years married) to:  Maud Marshall, Countess of Norfolk and WarenneDaughter of William Marshal, 1st Earl of Pembroke and Isabella FitzGilbert de Clare, 4th Countess of Pembroke. Born ± 1192 Died 27 Mar 1248, approximately 56 years, 1st married/ related to: Hugh Bigod, 3rd Earl of Norfolk, 2nd marriage to: William de Warenne, 5th Earl of Surrey Notes: Maud's two marriages are evidence through her holding the titles Countess of Norfolk from Hugh Bigod, and Countess of Warenne from William de Warenne. Child: 1. John de Warenne, 6th Earl of Surrey 1) 2)Born 1231 Died ± 29 Sep 1304, approximately 73 years | |||
Sources
1) Source: Exchequer: Treasury of Receipt: Ancient Deeds, Series A "Grant by Robert de Ver, Earl of Oxford, to William de Warenne, eldest son of John, Earl Warenne, and to Joan, Earl Robert's eldest daughter, of the manor of Medmenham and land in Cestresham, and to the heirs of the said William by her, with remainders."Dated: 30 Sep 1284. External Linkhttp://discovery.nationalarchives.gov.uk/details/r/C4938766. Reference: E 40/13 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward I 15 December 1286:"Sir Robert de Veer, earl of Oxford, father of the said Joan... who still survivesJohn his son...is his next heir...held of Sir John earl of Warrenn' for life, with reversion to the said earl his father". External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol2/pp377-383. Reference: C 133/47/13, William de Warrenna: Oxfordshire, Norfolk, Buckinghamshire, Essex, Cheshire, Flintshire (Data from secondary evidence)