Sir Piers de Montfort [e] b abt 1215, of Beaudesert, Worcestershire, England, d 4 Aug 1265, Battle of Evesham, Worcestershire, England. He md Alice de Aldithley abt 1238, daughter of Sir Henry de Aldithley and Bertrade de Mainwaring.

Child of Peter de Montfort and Alice de Aldithley was:

Sir Piers de Montfort [e] b abt 1240, of Beaudesert, Worcestershire, England, d bef 4 Mar 1286/87. He md Maud de la Mare abt 1266, daughter of Sir Henry de la Mare and Joan de Neville. Children of Peter de Montfort and Maud de la Mare were:

Sir John de Montfort, Lord Montfort, b abt 1271.

Elizabeth de Montfort b abt 1279, of Warwickshire, England. She md Sir William de Montagu, Lord Montagu, Knight, abt 1295, son of Sir Simon de Montagu, Lord Montagu, Knight, and Hawise de St. Amand.

Maud de la Mare [a] b abt 1252, of Ashtead, Surrey, England, d aft 1289. She md Sir Piers de Monfort abt 1266, son of Sir Piers de Montfort and Alice de Aldithley.

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http://www.medievalgenealogy.org.uk/cp/montfort.shtml

Some corrections and additions to the Complete Peerage: Volume 9: Montfort (Volume 9, page 127), which says: "He [Piers de Montfort (d. 1286/7)] m., circa 1260, Maud, da. and h. of Matthew, son of Henry DE LA MARE, with whom he had Ashtead in Surrey.(q)" Note q: V.C.H. Surrey, vol. iii, p. 248

Correction: Contemporary sources identify Maud as the daughter and heir of Henry, not Matthew, de la Mare, who was dead by 1265. In June or July 1280 Maud and Hawise, the wife of Robert le Veel, appear as daughters and coheirs of Joan de la Mare, deceased. Circumstantial evidence suggests that Hawise was the daughter of Joan by a subsequent husband, Walter de la Hyde, to whom she was married by 1260.

VCH Surrey cites two contemporary sources which describe Maud as the daughter and heir of Henry de la Mare [Coram Rege Roll 11, m. 14d; Abbreviatio Placitorum, 152]. She is also described as Henry's daughter and heir on 7 May 1265 [Calendar of Close Rolls, 1264-1268, p. 55]. VCH also notes that a pedigree in De Banco Roll 926, m. 427, makes Maud the daughter of Matthew, son of Henry, but as this dates from 1493 obviously the contemporary sources must be preferred.

In June or July 1280, Peter de Montfort and Maud, his wife, and Robert le Veel and Hawise, his wife, sought the manor of Norton, Somerset, which they claimed as the right of Maud and Hawise as daughters and coheirs of Joan de la Mare [Somerset Record Society, vol. 44, pp. 60-62]. In 1260, Peter de Montfort had ejected Walter de la Hyde and Joan, his wife, from half the manor of Ashtead, which they held by virtue of the wardship of Maud [Victoria County History, Surrey, vol. 3, p. 248]. In 1262 the manor of Cokeham, in Sompting, Sussex, was settled on Walter and Joan; its reversion was later sold by Hawise, the wife of Robert le Veel [Victoria County History, Sussex, vol. 6, part 1, p. 57].

[This evidence was provided by Douglas Richardson in November 2004. This question was also discussed by John P. Ravilious, Rose in Ashtead and Mark Harry. Item last updated 2 December 2004.]