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'Prudence [daughter of William Marche, the Elder]), m. before 29 Apr. 1612 ------ Jackson [?].'
"Nicholas Jackston[?]" was a witness to the 1616 will of "Johane Marche of Sherford, co. Devon, widow".
It is reasonable to suppose that this was the husband of Joan's sister-in-law Prudence, as the other witness was Joan's brother-in-law George March.