| Name | Role | Place | Source | |
|---|---|---|---|---|
| Cornelis Willemsen van Leeuwen | Person in notarial deed | 1704 | Kockengen | Notarial records |
| Cornelis Willemsen van Leeuwen | Groom | 1653 | Rotterdam | Church records marriages |
| Cornelis Willemsen van Leeuwen | Witness | 1730 | Mijdrecht en Wilnis | Church records baptisms |
| Cornelis Willemsen van Leeuwen | Witness | 1730 | Mijdrecht en Wilnis | Church records baptisms |
| Cornelis Willemsen van Leeuwen | Witness | 1730 | Mijdrecht | Church records baptisms |
| Cornelis Willemsen van Leeuwen | Witness | 1730 | Mijdrecht | Church records baptisms |
| Cornelis Willemsen van Leeuwen, broer | Creditor | 1694 | Notarial records |
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