| Name | Role | Place | Source | |
|---|---|---|---|---|
| Willem Pyetersz | Mention | 1616 | Woerden | Notarial records |
| Willem Pyetersz | Mentioned | 1574 | Leiden | Notarial records |
| Willem Pyetersz Biscop | Deceased | 1578 | Rotterdam | Church records burials |
| Willem Pyetersz Vereijcke | Groom | 1667 | Delft | Church records marriages |
| Willem Pyetersz. | Borg | 1606 | Leiden |
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