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William de Ferrers 4th Earl of Derby
(Bef 1170-1247)
Agnes of Chester Lady of Chartley
(Abt 1174-1247)
William Marshal 1st Earl of Pembroke
(Abt 1146-1219)
Isabel de Clare Countess of Pembroke
(Abt 1172-1220)
William de Ferrers 5th Earl of Derby
(Abt 1193-1254)
Sibyl Marshal
(-Bef 1238)
Isabel de Ferrers
(Abt 1220-Bef 1260)


Family Links

1. Gilbert II Basset
2. Reynold de Mohun

Isabel de Ferrers 2 3

  • Born: Abt 1220
  • Marriage (1): Gilbert II Basset before 18 Jun 1240 1
  • Marriage (2): Reynold de Mohun before 1244 1
  • Died: Bef 26 Nov 1260 1 2 3 4

  General Notes:

ISABEL (-before 26 Nov 1260). The Chronicle of Tintern Abbey, Monmouthshire names "Agnes, secunda Isabella, tertia Matilda, quarta Sibilla, quinta Johanna, sexta Alianora, septima Agatha" as the seven daughters of "Willielmo de Ferrers comiti Derbiæ" and his wife "quarta filia…Willihelmi Marescalli…Sibilla", adding that Isabel married "Reginaldo de Monteminori", by whom she was mother of "Willihelmus de Monte" who died childless, "filiam…Alianore" who married "Johanni filio Nicholai de Carrew", "Margareta soror eius" who died childless, and "Maria soror eius" who married "Johanni Meriot" but died childless. The Annals of Ireland record that "Sibilla comitissa de Ferreys" had seven daughters (in order) "secunda, Isabella Basset…". A charter dated 18 Jun 1240 records that "the town of Greywell" was given "as a marriage portion to Gilbert Basset with Isabel daughter of William de Ferrariis, the earl´s [G. Marshal Earl of Pembroke] niece". A charter dated 28 Jun 1248 records that "Margaret late Countess of Lincoln…recovered her dower out of the lands in Ireland of W[alter] Marshall late Earl of Pembroke her husband" and that the dower was "taken out of the portions of the inheritance which accrued to William de Vescy and Agnes his wife, Reginald de Moun and Isabel his wife, Matilda de Kyme, Francis de Boun and Sibil his wife, William de Vallibus and Alienor his wife, John de Moun and Joan his wife, Agatha de Ferrers in the king´s custody, and Roger de Mortimer and Matilda his wife". A charter dated 26 May 1250 records the restoration of property, granted to "Margaret Countess of Lincoln", to "William de Vescy and Agnes his wife, Reginald de Moun and Isabel his wife, William de Fortibus and Matilda his wife, Francis de Boun and Sibil his wife, William de Vallibus and Alienor his wife, John de Moun and Joan his wife, Agatha de Ferrers in the king´s custody, Roger de Mortimer and Matilda his wife, and William de Cantilupe and Eva his wife". A manuscript records the death "III Kal Feb" 1257 of "dominus Reginaldus de Mohun fundator" and in 1260 of "Isabella Basset uxor Reginaldi prædicti". A writ dated 26 Nov "45 Hen III", after the death of "Isabel Basset" names "William son of Reginald de Moun and the said Isabel, age variously stated as 6 and 7, is her heir".

m firstly (before 18 Jun 1240) GILBERT Basset [II] of Wycombe, son of ALAN Basset & his first wife Alice de Grey (-31 Jul 1241).

m secondly (1243 or before) as his second wife, REYNOLD de Mohun of Dunster, son of REYNOLD de Mohun & his wife Alice Briwere (-Tor Mohun, Devon 20 Jan 1258, bur Newenham).

[FMG/Medieval Lands]


He [Reynold de Mohun] married, 2ndly, in or before 1243, Isabel, the childless widow of Sir Gilbert BASSET, and daughter of William (DE FERRERS), EARL OF DERBY, by his 1st wife (to whom she was coheir), Sibyl, daughter and eventually coheir of William (MARSHAL), EARL OF PEMBROKE. He died 20 January 1257/8, at Tor Mohun in Devon, and was buried at Newenham in front of the high altar, on the left-hand side. His widow died before 26 November 1260, when the writ to the escheator issued.

[Complete Peerage IX:20, XIV:478, (transcribed by Dave Utzinger)] 1


• Inquisition, 26 Nov 1260. 4 500. Isabel Basset. Writ de escaeta, 26 Nov. Inq. Friday after St. Lucy, 45 Hen. III.

William, son of Reginald de Moun and the said Isabel, age variously stated as 6 and 7, is her heir.

[Southampton.] Grewell manor was sometime the king's escheat through the death of Gilbert de Aquila, and the king that now is gave it to Gilbert Marescall to hold at the king's will for 4l. yearly, and by service of sending 10 men to reap for a day at Odiham in the autumn, the king feeding them, and doing suit at the hundred (court) of Odiham. Afterwards the said Gilbert gave the manor to Gilbert and Isabel Basset to them and the heirs of their bodies, and it was put in the charter that if the said Gilbert Marescall could not warrant them the manor against the king, he should give them land to the same value between Caversham bridge and Saverne water. And because the said Gilbert Marescall held at the king's will, and there is no heir left born of the said Gilbert and Isabel, the manor is the king's escheat through the death of the said Isabel.

Wilts. Inq. Saturday before St. Peter in cathedra, 45 Hen. III.

Mildehal manor, held in free marriage of the gift of Sir William de Ferers her father, in chief 'de Marscalsia,' and no service was held of that manor. And whatever else she held in the county was of the dower of Sir Gilbert Basset.

[Southampton.] Writ (de melius inquirendo), 24 Feb. Inq. Tuesday after St. Matthias, 45 Hen. III.

Grewell manor was the ancient demesne of King Henry the king's grandfather, and he gave it to Juliana de Aquila mother of Gilbert de Aquila.

C. Hen. III File 25. (15.)

Isabel married Gilbert II Basset, son of Alan Basset and Alice de Grey, before 18 Jun 1240.1 (Gilbert II Basset died on 31 Jul 1241 1.)

Isabel next married Reynold de Mohun, son of Reynold de Mohun and Alice de Briwere, before 1244.1 (Reynold de Mohun died on 20 Jan 1258 in Tormohun (Torre Abbey), Torquay, Devon, TQ1, GB 1 and was buried in Newenham Abbey, Axminster, Devon, EX13, GB 1.)


1 Charles Cawley, <i>Medieval Lands</i>.

2 Frederick Lewis Weis, Walter Lee Sheppard, William Ryland Beall, <i>Magna Carta Sureties 1215: the Barons Named in the Magna Carta, 1215 and Some of their Descendants who Settled in America during the Early Colonial Years</i> (Genealogical Publishing Company, 1999), 149a-3.

3 George Edward Cokayne, "Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom" (Sutton Publishing Ltd., 2000), IX:20.

4 J E E S Sharp and A E Stamp, <i>Calendar of Inquisitions Post Mortem </i> (London: n.p., n.d.), 1 Henry III: 137-143.

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