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Probably died 1814.
London Deaths & Burials Index for St Martin in the Fields register dated 22nd May 1814. Aged 60 years; last address Northumberland Street.

9 July 1814 Isaac Jone of Northumberland Court in the Parish of Saint Martin in the Fields Middlesex will proved at London. Reference: TNA PROB 11/1558/231 Very short document, less than half of a page including probate statement. Wife Ann sole Executrix and only other name mentioned in the will.