I have a John Samuel who married Abigail Powis at St Mary Islington on 12 October 1800. Their children were Ann (1801), Mary Elizabeth (1802) and Elizabeth (1805), all christened at St Leonards Shoreditch. John Samuel died around 1805-8, as his widow remarried in 1808, to Charles Bragger. Is this John Samuel one of yours? I guess he was born around 1780.