Přemysl Ottokar II (1253–78) married a German princess, Margaret of Babenberg, and became duke of Austria. He thereby acquired Upper Austria, Lower Austria, and part of Styria. He conquered the rest of Styria, most of Carinthia, and parts of Carniola. He was called "the king of iron and gold" (iron because of his conquests, gold because of his wealth). He campaigned as far as Prussia, where he defeated the pagan natives and in 1256, founded a city he named Královec in Czech, which later became Königsberg (now Kaliningrad).