- Catelinus, died a.d. 574, Italian ecclesiastic: pope 561–574.
- John Sobieski, 1624–96, king of Poland 1674–96.
- John. John III(def 2).
- 1507–57, king of Portugal (1521–57): his reign saw the expansion of the Portuguese empire overseas but the start of economic decline at home
- surnamed Sobieski. 1624–96, king of Poland (1674–96). He raised the Turkish siege of Vienna (1683)