Stachus is a large square in central Munich, Bavaria. The square was officially named Karlsplatz in 1797 after the unpopular Charles Theodore, Elector of Bavaria. Munich natives seldom use that name, calling the square instead Stachus, after the pub Beim Stachus, once owned by Eustachius Föderl, that was located there until construction work for Karlsplatz began. Even the U-Bahn and S-Bahn announcements use the unofficial name.