related to the German word for moorland (German: die Heide), or adopted from the German/Polish/Silesian term for hajduk(s) (Polish (plural): Hajduki; German (singular): Heiduck), which locally meant bandits. The place was first mentioned in 1627 as Hejduk and shown on 18th century maps as "Ober Heiduk" and "Nieder Heiduk" (i.e., Upper and Lower Heiduk). The later names Hajduki Wielkie and Nowe Hajduki mean Great Hajduks and New Hajduks, respectively. The two settlements were merged in 1903 and named after the Bismarck Iron Works Bismarckhütte. When the international borders shifted, the name of Bismarck was replaced with the name of the Polish king Batory (so-chosen to preserve that initial "B", which appeared on an economically important local trademark). Today this city subdivision is called Chorzów IV or Chorzów-Batory. From 12th century to World War I Village of Chorzów In the 12th century, the castellany of Bytom, including the Chorzów area, belonged to the Seniorate Province (Kraków Duchy) of Poland. In 1179 it was awarded by Duke Casimir the Just to the Duke of Opole, and since that time the history of Chorzów has been connected to the history of Upper Silesia (Duchy of Opole). The oldest part of the city, the village of Chorzów, today called Chorzów Stary, belonged since 1257 to the Equestrian Order of the Holy Sepulchre of Jerusalem. Already at that time silver and lead ores were mined nearby, later also the ores of iron. There is more documentation for 16th century developments. From 1327, the Upper Silesian duchies were ruled by the dukes of the Piast dynasty and were subject to Bohemian overlordship. The Crown of Bohemia elected Polish-Lithuanian Jagiellons kings from 1471 and Austrian Habsburgs kings after 1526. In 1742, the area was conquered by the Prussian Hohenzollerns in Silesian Wars, setting the stage for the Prussian industrial might. The Prussian and then German period lasted for about 180 years and overlapped with the time of rapid industrialization. Royal iron works, coal mines and chemistry With the discovery of bituminous coal deposits at the end of the 18th century by the Polish local priest Ludwik Bojarski, new industrial sectors developed in the Chorzów area. In the years 1791–1797 the Prussian state-owned Royal Coal Mine was constructed (Kopalnia Król, Königsgrube, later renamed several times with the changing political winds). In 1799, first pig iron was made in the Royal Iron Works (Królewska Huta, Königshütte). At the time,