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Glamorgan Archives
Thomas family, of Llanbradach and Ystrad Mynach estates, records

Reference code(s): GB 0214 DTHO

Held at: Glamorgan Archives

Title: Thomas family of Llanbradach and Ystrad Mynach Estates records

Short Title: Thomas family, of Llanbradach and Ystrad Mynach estates, records

Creation date(s): [c. 1528]-[c. 1953]

Level of description: Fonds

Extent: 1.00 cubic metres (1026 items and bundles)

Name of creator(s): Thomas family, of Llanbradach and Ystrad Mynach


Administrative/Biographical history: John Thomas, of Llanbradach, Glamorgan, was succeeded by his son William Thomas (d. pre-1664), who married Joan Llewelyn of Rhydlafar in the same county. Their son, Thomas Thomas (fl. 1664) of Llanbradach and Rhydlafar, was succeeded by his son, William Thomas (fl. 1668-1675). His son, Thomas Thomas (d. 1720), of Llanbradach, was succeeded by his son, James Thomas of Llanbradach, who died in 1731 without issue. The estate then passed to his cousin, Thomas Thomas (fl. 1731), of Tredomen and Ystrad Mynach, Glamorgan. Thomas Thomas's son, William Thomas (fl. 1759), conveyed Ystrad Mynach to his brother, Thomas Thomas (d. 1807), under the terms of his father's will, but died without issue, when the estate was re-united. Thomas Thomas married Jane Griffiths, of Gellifendigaid in the parish of Llanwonno (the sister and heir of Richard Griffiths, who died in 1826), and he was succeeded by his two surviving sons, Thomas Thomas (1778-1859), of Llanbradach, and the Rev. George Thomas (d. 1860), of Ystrad Mynach. Thomas Thomas (1778-1859) of Llanbradach acquired Pencerrig (Radnorshire) in right of his first wife, Anna Maria Joanna Jones, of Pencerrig. Their only child, Thomas Jones Thomas, died, aged five, in 1810. For his second wife, Thomas Thomas took Bridget Gwynne ([c. 1783]-1857) of Llanelwedd (Radnorshire). In 1835, their child, Clara (d. 1877), married Henry Thomas (d. pre-1873), of Llwynmadoc (Brecknockshire). Their son, Evan Llewellyn Thomas (1839-1864), died without issue, and they were succeeded by their only surviving child, Clara Thomas, who died in 1914, also without issue. Llanbradach passed to the descendants of the Rev. George Thomas (d. 1860) of Ystrad Mynach. Llwynmadoc and Pencerrig were inherited by a second cousin, Henry Algernon Evan-Thomas. The Rev. George Thomas (d. 1860), of Ystrad Mynach, married Eliza Crawshay, and was succeeded by their son, George William Griffiths Thomas (d. 1885), who was succeeded by his son, Edward Llewellyn Thomas ([c. 1869]-1890). He was succeeded by his sisters, Katherine Ellen (fl 1889), Rosa Maud Mary (d. 1947) and Gwladys Jessie, who each left issue. The estate had substantial industrial interests, including coal mining, canals and railways, and gas and water supply.


Scope and content/abstract: Deeds and documents relating to the Llanbradach, Ystrad Mynach and Tredomen estates in Glamorgan, [c. 1528]-[c. 1944], and to a lesser extent, Monmouthshire, 1701-1942; and to the Pencerrig estate in Breconshire, 1680-1933, and Radnorshire, 1574-1923; estate administration records, including accounts, 1753-1953, correspondence, 1869-1943, and plans, 1763-95; and deeds and documents, [c. 1792]-[c. 1938], relating to industrial concerns, including canals, tramroads, railways, collieries, quarries, and gas and water undertakings, in Glamorgan and Monmouthshire, including leases, correspondence, plans, notices, royalty accounts and share certificates.


Language/scripts of material: English

System of arrangement: Arranged into four sections: estate deeds; industrial; estate general; and out-county. Estate deeds and out-county papers are arranged chronologically within each parish or property. Industrial papers are arranged chronologically by industry and company. Estate general papers are arranged chronologically by record type.

Conditions governing access: No restrictions

Conditions governing reproduction: Normal Glamorgan Archives conditions apply.

Finding aids: A full version of the catalogue can be searched online at


Appraisal, destruction and scheduling information: All records deposited at Glamorgan Record Office have been retained.

Accruals: Accruals are not expected.

Archival history:

Immediate source of acquisition:



Note: Title supplied from contents of fonds.

Archivist's note: Compiled by Stephen Benham for the HMC/NLW Family and Estates project. The following source was used in the compilation of this description: Glamorgan Record Office, Catalogue of the Records of the Thomas family of Llanbradach and Ystrad Mynach.

Rules or conventions: This description follows ANW guidelines based on ISAD(G) Second Edition; AACR2 and LCSH.

Date(s) of descriptions: March 2001; amended June 2005

Canals | Wales | Glamorgan
Canals | Wales | Monmouthshire
Coal mines and mining | Wales | Glamorgan
Coal mines and mining | Wales | Monmouthshire
Deeds | Wales | Glamorgan
Deeds | Wales | Monmouthshire
Deeds | Wales | Powys
Estate administration | Wales | Glamorgan
Estate administration | Wales | Monmouthshire
Gas industry | Wales | Glamorgan
Gas industry | Wales | Monmouthshire
Quarries and quarrying | Wales | Glamorgan
Railways | Wales | Glamorgan
Railways | Wales | Monmouthshire
Thomas family, | of Llanbradach and Ystrad Mynach | Archives
Tramroads | Wales | Glamorgan | Design and construction
Waterworks | Wales | Glamorgan
Waterworks | Wales | Monmouthshire

Personal names
Thomas family , of Llanbradach and Ystrad Mynach

Corporate names
Llanbradach Estate | (Wales)
Pencerrig Estate (Wales)
Tredomen estate
Ystrad Mynach Estate (Wales)

Glamorgan (Wales)
Llanbradach (Wales)
Llanelwedd (Wales)
Monmouthshire (Wales)
Ystrad Mynach (Wales)

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