Karl von Hessen-Kassel

Baptism date: 
August 3, 1654
Burial date: 
March 22, 1730

1685 visited Leeuwenhoek in the fall (noted in Huygens Oeuvres Completes, v 9, p 38.

See also Send-Brief XX of March 13, 1716.

Leeuwenhoek's cover letter of April 20, 1702 mentions that Karl's son Friedrich and brother Philipp also visited.