Doop op 19 december 1726 te Amsterdam (Westerkerk)
https://archief.amsterdam/18570NFrv5L1F01/indexen/doopregisters_1564-1811/zoek/query.nl.pl?v1=Isaac François&a1=&d2=19&m2=12&y2=1726
Stadsarchief Amsterdam, DTB 134, p.231(folio 115v), nr.11