I have got as far back as 1803 - Israel Fidgeon - married to a Mariah Wombwell - 4 children - one of which, James was my great great great grandfather.
Are you giving 1803 as Israel's y.o.b.? Or have you taken that from the 1841 census??
The 1841 census is supposed to round down to the nearest 5 years of adults 15yrs plus
Israel's age was given as 38 in 1841 and 50 in 1851
1851 census image gives p.o.b. as Rochford
Burial index gives his y.o.b. as approx 1799
Burial
18/11/1858
St Peter Anglican Thundersley Essex
Israel Fidgeon
age 59
so the baptism posted by amondg is a very strong possibility
you state Israel and Mariah had 4 children -
James, William, Emma & Israel -there was also a daughter Mary Ann who was age 8 on 1851 census
There is also this burial
15/05/1831
St Peter Anglican Thundersley Essex
Israel Fidgeon
age 2
wondered if he may have been Israel & Mariah's child
Suz