Jan de Jani (1400-1461)-of the Clan of Ostoja, first polish Duke of Pomerania from year 1454, one of the leading forces of Prussian Confederation, commander in Thirteen Years' War (1454--66).
Jan de Jani (1400-1461)-of the Clan of Ostoja. First polish Duke (voivode) of Pomerania from year 1454, one of the leading forces of Prussian Confederation, commander in Thirteen Years' War (1454--66).