Gruźewski Jan (Gružewski Joannes)
- Born (year): 1578 Nowogródek – 1646 Warszawa
- Source 1: Ultima et maxima hominis mutatio, Vilnae, 1641, 1644. (VUB F 3–2107)
- Important places (EN/modern local): Vilnius, Pułtusk,
- First letter of last name: g
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