The marriage was 1802 so pre-civil regt.
John Kalkhill, mariner, born c.1773, & Ann Phillips married in Penzance, Cornwall.

Alison, perhaps it would help if you posted the exact details given on his death cert., at his burial, M.I., and from census returns if still alive, rather than just the marriage?

And also the details of his children or whatever confirmed that the above John C. & Ann were their parents?

Sue