Jacob van Leeuwen
- Born: 8 Sep 1754, Leiden, , Zuid-Holland, Netherlands
- Marriage (1): Catharina Hollaart on 12 Apr 1776 in Leiden, , Zuid-Holland, Netherlands
- Marriage (2): Neeltje Klinkenberg on 20 Nov 1800 in Leiden, , Zuid-Holland, Netherlands
- Died: 13 Jan 1822, Leiden, , Zuid-Holland, Netherlands at age 67
 Noted events in his life were:
• Occupation: Ruymen.
Jacob married Catharina Hollaart, daughter of Cornelis Hollaers and Jannetje Molenaer, on 12 Apr 1776 in Leiden, , Zuid-Holland, Netherlands. (Catharina Hollaart was born on 5 Aug 1753 in Leiden, , Zuid-Holland, Netherlands and died on 1 Mar 1800 in Leiden, , Zuid-Holland, Netherlands.)
Jacob next married Neeltje Klinkenberg, daughter of Cornelis Klinkenberg and Neeltje Romans, on 20 Nov 1800 in Leiden, , Zuid-Holland, Netherlands. (Neeltje Klinkenberg died on 30 Dec 1821 in Leiden, , Zuid-Holland, Netherlands.)
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