Sibilla de Tregoz, co-heiress of Ewyas-Harold

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Sibilla Grandison (de Tregoz)

Also Known As: "Sybil"
Birthplace: Ewyas Harold, Herefordshire, England
Death: October 21, 1334 (61-67)
Herefordshire, England
Place of Burial: Abbey Dore, Herefordshire, England
Immediate Family:

Daughter of Sir John de Tregoz, II, Lord of Ewyas Harold and Mabel FitzWarin
Wife of William de Grandison, 1st Lord Grandison
Mother of Peter de Grandison, 2nd Lord Grandison; Mabel de Grandison, Lady of Bletsoe; Sir Otes ‘Otto’ de Grandison; John de Grandisson, Bishop of Exeter; Agnes de Grandison, Lady Bardolf and 1 other
Sister of Clarice de Tregoz, co-heiress of Ewyas-Harold

Occupation: Co-heir of her father
Managed by: Andrew Dean Kemp
Last Updated:

About Sibilla de Tregoz, co-heiress of Ewyas-Harold


Retrieved from on 18 August 2023 and then edited.

Sibyl de Tregoz was the daughter of John De Tregoz, Knt and Mabel FitzWarin. Her birth date is approximately 1271.

With her sister, Clarice Tregoz La Warre, she was a co heir of their father. She Inherited half of the Barony of Ewyas Harold.


Sibyl Tregoz married William de Grandison, Knt., younger son, minor in 1263. They married before 1285.

Children of Sibyl de Tregoz with William de Grandison, Knt.

  1. Peter De Grandison, Knt., 2nd Lord Grandison, son and heir. He married before 10 June 1330 Blanche De Mortimer. Sir Peter de Grandison, 2nd Lord Grandison, died 10 August 1358.
  2. John De Grandison, Chaplain to Pope John XXII, Bishop of Exeter, born in 1292. John De Grandsion, Bishop of Exeter, died 16 July 1369.
  3. William De Grandison, Archdeacon of Exeter.
  4. Thomas De Grandison, clerk. He died at the Roman curia shortly before 4 August 1317.
  5. Otes De Grandison, Knt. He married before 28 October 1340 Beatrice Malmains. They had three sons, Thomas, K.G. [4th Lord Grandison], Walter, and Peter, and one daughter, Elizabeth. Sir Otes De Grandison died 23 May 1359.
  6. Edmund.

They had four daughters,

  1. Agnes,
  2. Mabel,
  3. Maud [Prioress of Aconbury], and
  4. Katherine.


Sibyl, died 21 (or 22) October 1334. William De Grandson, 1st Lord Grandison, died 17 June 1335.


~Ancestral Roots of Certain American Colonists, 8th Edition, 8A:31,

Sibyl de Tregoz given as the wife of William de Grandison and mother of Katherine de Grandison who married Sir William de Montagu. 160

~Cokayne's Complete Peerage, 2nd Edition, (Tregoz), Vol. XIIB, p. 22,

Sibyl, was one of the younger of the two daughters of John, Lord of Tregoz by his first wife. She married, as his first wife, William de Grandison, 1st Lord Grandison, sometime before 1285. Sibyl died 21 Oct 1334, and was buried in Dore Abbey. 141

• Background Information. 1007

From The Topographer and Genealogists, 1853, Vol. II, pp. 131-132:

"Sibilla Tregoze, who was living at her father's death 28 Edward I and then 28 years of age, being wife of William de Grandison (or as it was then latinized 'de Grandi Sono,') some time of Exon Hill, co. Glouc. to whom he married about or before 13 Edward I when her father settled upon her and her husband lands at Lydiard Tregoze in Wilts, in marriage. From this marriaged descended the Scudamores of Hom-Lacy, in Herefordshire."

• Background Information. 1400

Land that became Teffon Evias manor was held in 1086 by Alfred of Marlborough. Alfred also held an estate in Herefordshire and Teffont was granted, possibly before 1100, to Harold of Ewyas (fl. 1100) and passed to his son Robert of Ewyas (fl. 1147). The overlordship passed like Lydiard Tregoze with the honor of Ewyas to Robert's son, Robert of Ewyas (d. 1198), to that Robert's daughter Sibyl (d. c. 1236), the wife of Robert Tregoze (d. c. 1214), to Robert's and Sibyl's son Robert (d. 1265), [Ex. e Rot. Fin. (Rec. Com.), i. 307; Herefs. Domesday (Pipe R. Soc. N.S. xxv), 111; Rot. de Ob. et Fin. (Rec. Com.), 528] and to that Robert's son John. After John Tregoze's death in 1300 his daughter Sibyl (d. 1334), the wife of William de Grandison, was allotted the three parts of the fee held under her by Reynold Hussey.

~A History of the County of Wiltshire, Volume XIII, pp. 185-195

Sibyl married Sir William de Grandison 1st Baron of Grandison, son of Pierre de Grandison and Agnes de Neufchâtel.141 (Sir William de Grandison 1st Baron of Grandison was born about 1255 in Ashperton, Herefordshire, England, died on 27 Jun 1335 in Lambourn, Berkshire, England 141 and was buried in Dore Abbey, Abbeydore, Herefordshire, England.)

From FindAGrave

  • Birth: 1265 Ewyas Harold, Herefordshire Unitary Authority, Herefordshire, England
  • Death: Oct. 12, 1334
  • Burial: Dore Abbey Churchyard, Abbey Dore, Herefordshire Unitary Authority, Herefordshire, England

Sibyl was the younger daughter and coheir of Sir John Tregoz and Mabel FitzWarin. She married Sir William de Grandison, of Ashperton, Herefordshire about 1285 in Donyatt, Somersetshire County, England.Their children were Catherine, Piers and Agnes

Family links:

John de Tregoz (1230 - 1300)


  1. William de Grandison (1262 - 1335)*


  1. Otto de Grandison (____ - 1358)*
  2. Peter de Grandison (1286 - 1358)*
  3. John de Grandison (1292 - 1369)*
  4. Catherine de Grandison Montagu (1304 - 1349)*
  • Calculated relationship

Note: A special Thank you to Susan Lockwood for the sponsorship of this memorial

Created by: Kat Record added: Mar 27, 2012 Find A Grave Memorial# 87440418

Grandison and Tregoz

Source: Baronia Anglica Concentrata; Baronies in Fee. Vol II. by Sir T. C. Banks. Page 137. < Archive.Org >


  1. Baronia Anglica Concentrata, Or, A Concentrated Account of All the Baronies … Volume ll. by Thomas Christopher Banks. Publication date 1843. Page 137.< Archive.Org >
  2. Dore Abbey is a former Cistercian abbey in the village of Abbey Dore in the Golden Valley, Herefordshire, England. A large part of the original medieval building has been used since the 16th century as the parish church, with remaining parts either now ruined or no longer extant. The abbey was founded in 1147 by Robert fitzHarold of Ewyas, the Lord of Ewyas Harold, possibly on the site of earlier wooden monastic buildings of which no traces remain.
    1. the Herefordshire County Council site has an essay on the abbey, which testifies to the involvement of the Grandisons: “Among the recorded relics was a piece "of the Holy Cross, very beautifully adorned with gold and precious stones" donated by Lord William de Grandison in 1321. Dore's two skilfully carved effigies show how important it was for local barons who were not only buried here but also used the sacristy as a safe-deposit for valuables.”
  3. cites
    1. Richardson, Douglas. Magna Carta Ancestry: A Study in Colonial and Medieval Families, in four Volumes, Vol. II. 2011. By the Author. Salt Lake City, Utah. Lanvallay #5 Joan De Grelle, Page 579.
    2. G.E.C. The Complete Peerage. Vol. III. D. to F. 1890. George Bell & Sons, London. Page 45.[1]
    3. G.E.C. Vol IV. Complete Peerage. 1916. Pages, 139-41. La Warr, now De La Warr. < Archive.Org > Sir Roger la Warre,(e) of Wickwar, co. Gloucester, Brislington, Somerset, Milton, Folkington, Isfield, &?c., Sussex, s. and h. of Sir John la Warre (living 27 May I277),(f) of Wickwar and Brislington, by Olimpia, da. of Sir Hugh de Fokinton. … He m., in or before Sep. 1276, Clarice, elder da. and coh. of Sir John Tregoz, of Ewyas Harold, co. Hereford, AUington, Wilts, Albrighton, Salop, Great Doddington, Northants, &'c. [Lord Tregoz], by his 1st wife, Mabel, da. of Sir Fulk FiTz Warin, of Whittington, Salop. She was living in Apr. 1289, (d) and d. v.p., that is, before 28 Aug. 1300. He d. 20 June 1320. (e)
    4. Weaver, Frederic. The Visitations of the County of Somerset in the years 1531 and 1573 Exeter, 1885. page 88. < Hathitrust >
    5. Wickwire, Arthur Manley. Genealogy of the Wickware Family. 1909. The Curtiss-Way Co. N.Y. Page 22. < Archive.Org >
    6. Complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom Page 74: Grandison < Archive.Org >
    7. "Royal Ancestry" Douglas Richardson 2013, Vol. III. p. 98
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Sibilla de Tregoz, co-heiress of Ewyas-Harold's Timeline

Ewyas Harold, Herefordshire, England
Ashperton, Herefordshire, England
Bletsoe, Bedfordshire, England
Ashperton, Herefordshire, England
Ashperton, Herefordshire, England
April 21, 1302
Herefordshire, England
Chelsfield, Kent, England
October 21, 1334
Age 67
Herefordshire, England
April 29, 1933
Age 67