-Proruby (Lhoty u Potštejna-) is a place, that 1992 belonged to Czechoslovakia and was situated in the administrative region Východní Čechy.
-Proruby (Lhoty u Potštejna-) was formerly part of the German Empire. In the German Empire, the place was called Proruby. The place is now called -Proruby (Lhoty u Potštejna-) and belongs to Czechoslovakia.