• Christened: 30 Nov 1800, Illogan, Cornwall ¹
• Married: 24 Feb 1831, St. Clement, Cornwall ²
• Died: 6 Feb 1874, Kenwyn, Cornwall ^{3 5}
• Buried: 10 Feb 1874, Kenwyn, Cornwall ⁴

  Research Notes:

Jacob and his brother Benjamin were twins.

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Sole executor and residuary legatee of his father's Will (1829)

One of the Trustees of the Will of his brother Arthur Trewartha of Nancekuke (1842).

In 1851 Jacob Trewartha (50) of Illogan, farmer of 60 acres employing 1 labourer, and wife Elizabeth (46) of St. Clements were living in Pencoose, Kenwyn. With them were children (born in Kenwyn): John (16), William (14), Elizabeth (13), scholar, Julia M. (10), scholar, Susan (9), scholar, Emma (7), scholar.

In 1861 Jacob Trewortha (60) of Illogan, retired farmer, and wife Elizabeth (55) of Truro were living in Frances St., Kenwyn. Present were children (born in Truro): Elizabeth A. (23), Julia M. (20), Susan J. (10), Emma S. (16), scholar.

In 1871 Jacob Trewartha (70) of Illogan, retired farmer, and wife Elizabeth (66) of St. Clements were living in Frances St. Kenwyn. Son Henry and his family were living in the same street.

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Jacob Fox Trewartha of Frances Street Kenwyn died aged 73 years (burial record).

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The Will with a Codicil of Jacob Fox Trewartha late of the Parish of Kenwyn in the County of Cornwall, gentleman, who died 6 February 1874 at Kenwyn was proved 10 April at Bodmin by Henry Messer Trewartha of Kenwyn, draper, and John Trewartha of the Parish of Illogan in the said County, grocer, grocer, the sons and Elizabeth Trewartha of Kenwyn, widow, the relict, the executors. Effects under £450. ⁵