Jan z Jani (1400–1461) - of the Clan of Ostoja was the first Polish voivode of Pomerelia and one of the leaders of the Prussian Confederation, serving as a commander in the Thirteen Years' War. He was also the Lord of Regality of Tczew, Nowe and Kiszewskie, Lord of Starogard, Rabelnaw, Robaw, Pancze, Wonental, Szwarczenwalt, Weisenwalt, Moealwalt, Landesende, Turze, and Lord of Gniew.