Jan van Leeuwen
Patronymic:
Claes
Antony's:
niece's husband or his nephew
Leeuwenhoek's sister Catharina married Claes Jans van Leeuwen. Their daughter Rijckje (1656-1735), Leeuwenhoek's niece, married Jan van Leeuwen, who was later steward to the Russian Czar. This Jan Leeuwen may well have been the one to whom Leeuwenhoek addressed Letter 109 of 1697年09月03日 (AB 187).
The letter could, however, have been addresed to Rijckje's brother Jan van Leeuwen, living in Rotterdam and through whom Leeuwenhoek had the Royal Society ship packets.
