Knurów ('knuruf; Knurow; Knurōw) is a city near Katowice in Silesia, southern Poland. Knurów borders on the Upper Silesian Metropolitan Union, a metropolis with a population of two million. Knurów is located in the Silesian Highlands, on the Bierawka River, a tributary of the Oder River. Knurów's history as a city is relatively short, as it only became a town in 1951, when also the settlements of Krywałd and Szczygłowice were included within its town limits as districts. However, Knurów's existence can be traced back as far back as ca. 1295–1305, when it was mentioned in the Liber fundationis episcopatus Vratislaviensis chronicle, and was part of Piast-ruled Poland. It was then mentioned as Knauersdorf or Cnurowicz, and later on mostly appeared in documents under its current name. Later on, it was also part of Bohemia (Czechia), Prussia and Germany. Throughout centuries, Knurów was a private village, and among its owners were the Goszycki, Węgierski and Paczyński families. The town rapidly grew at the end of the 18th century as the Industrial Revolution came and vast coal reserves were found in the area. In the late 19th century, the settlement had a population of 776. In 1904, the first mine shaft was opened, and in 1908-1909 a railway line connecting Knurów with Rybnik was built. In 1912, the first strike took place at the local mine. After World War I, in 1918, Poland regained independence, and following the Polish Silesian Uprisings Knurów was reintegrated with Poland. In the interwar period, Knurów developed intensively. New schools, stadiums, a pipeline connecting with Bełk and the first synthetic ammonia plant in Poland were built. In 1923, a monument to the participants of the Silesian Uprisings was unveiled. The coal industry continued growing well in the 20th century, and doubled its output with a new mine being built in 1961 in Szczygłowice. Knurów and the present-day districts of Krywałd and Szczygłowice were invaded by Germany on September 1, 1939, the first day of the invasion of Poland and World War II.