Brock Family History

John Thomas

1754 – ?
✓ Validated against records · 2026-07-04

John Thomas stands at the top of the Thomas line, and he is a Cornishman: baptised on the 17th of March 1754 at Illogan, on the mining coast above Redruth, the son of John Thomas and Margaret Vivian. Mum connected the family to Mevagissey, the fishing port on the other coast of Cornwall — and the Vivian name his mother carried would return to the family three generations later, when his great-grandson's widowed mother married a Brixham Vivian.

How he came east the record doesn't say, but the Brixham register of 1781 catches him mid-journey: "John Thomas of the parish of Loggon in Cornwall, sojourner of this parish, and Priscilla Maddick, sojourner in this parish, were married in this church by banns this tenth day of December 1781." Two sojourners — neither of them Brixham people, both passing through the port, both making their marks: John and Priscilla could not write their names. Two generations on, every Thomas bride and groom in this story signs.

Probably a mariner, he raised his family on the move around the Devon ports: twin boys baptised at Brixham in 1784; William — this line's ancestor — born at Devonport in 1786 and baptised at the Princes Street Independent chapel; Nicholas and Ann baptised at another dissenting meeting at Plymouth Dock in 1789. Where and when John died is not known — the line's first honest wall. What is known is what came of him: five generations of seafarers that ran from the marks in a Brixham register to a Hull smack skipper, and then to Jenny.

Composed from validated records · 2026-07-04
Birth
March 17th 1754, Illogan, Cornwall
Marriage
December 10th 1781 in St Marys parish church, Brixham to Priscilla Maddick
Parents
John Thomas and Margaret Vivian
Siblings
John Thomas baptised March 17th 1754, Illogan, Cornwall Margett Thomas baptised September 17th 1758
Children
William Thomas baptised September 12th 1784 Brixham, Devon John Thomas baptised September 12th 1784 Brixham William Thomas born February 3rd 1786, baptised April 14th 1786, Princes Street Independent, Devenport Nicholas Thomas, baptised February 25th 1789 Morrices Square Independent, Plymouth Dock Ann Thomas baptised February 25th 1789 as above All these (Nicholas, Ann, John and Priscilla Thomas) of Mevagissey in Cornwall
1781
Marries Priscilla Maddick in St. Marys Brixham John Thomas of the parish of Loggon in Cornwall ,sojourner of this parish, and Priscilla Maddick, sojourner in this parish were married in this church by banns this tenth day of December 1781, in the presence of Francis Stephens and Richard Kerswell. Both John and Priscilla made their marks (+;0)
Occupation
Probably a mariner
In your grandmother’s words · from her notebook

Family

Marriage

Children

WTChild · the line continuesWilliam Thomasmain line1786–1811

Life

Confirmed — anchored to a recordEstimated — inferred
1754

Illogan, Cornwall — the line begins Cornish

17 March 1754 at Illogan

March 17th 1754, Illogan, Cornwall— From Janet Brock’s research
Mum’s record Evidence
From Janet Brock’s research notebook.
1781

Married Priscilla Maddick

10 December 1781 at St Marys parish church

John Thomas of the parish of Loggon [Illogan] in Cornwall, sojourner of this parish, and Priscilla Maddick, sojourner in this parish, were married in this church by banns this tenth day of

December 1781, in the presence of Francis Stephens and Richard Kerswell. Both John and Priscilla made their marks.

— Two sojourners marry — Mum's register reading (1781)
Mum’s record Evidence
From Janet Brock’s research, cited — not yet re-verified at the image:
  • Two sojourners marry — Mum's register reading (1781) — Janet's transcription from the register of St Mary's, (Higher) Brixham, on her page for John. Register image to be re-verified and cited in a Devon parish-register session. from Mum’s research

Occupation

Probably a mariner— From Janet Brock’s research
Mum’s record Evidence
From Janet Brock’s research notebook.

Our research

The Cornish wall

Open research · Illogan, Mevagissey & Brixham

  • His death is unknown — no year, no place. He was alive raising children to 1789; after that, silence. Brixham and Devonport-area burials, and Cornwall if he went home, are the searches — a common name in a mobile trade makes this a genuine wall until an occupation or address pins him.
  • The Illogan baptism (17 March 1754) and his parents' marriage — John Thomas and Margaret Vivian, Cornwall — want register images (Cornwall parishes on findmypast/FamilySearch). His sister Margett was baptised September 1758.
  • Mevagissey — Mum's page links the family ("Nicholas, Ann, John and Priscilla Thomas") to Mevagissey without naming her source: recover it. If right, the family worked between Cornwall's fishing ports and Devon's — which would explain the sojourners of 1781.
  • Priscilla Maddick — born about 1758; Mum built Maddick pages (Daniel Maddick and a fifteen-page branch index) that await their own pass.