Duchy of Racibórz
Since the 12th century, the river formed the eastern border of the Silesian Duchy of Racibórz, with Lesser Poland. From 1846 until 1918, the so-called Three Emperors' Corner at the confluence of Black and White Przemsza marked the tripoint of the Kingdom of Prussia, the Austrian Empire and the Russian Empire. Nowadays the lower Przemsza is the border between the Silesian Voivodeship in the west and the Lesser Poland Voivodeship in the east.