The Isartor at the Isartorplatz in Munich is one of 4 main gates of the medieval city wall. It served as a fortification for the defence and is the most easterly of Munich's three remaining gothic town gates (Isartor, Sendlinger Tor and Karlstor). The gate is located close to the Isar and was named after the river. The Isartor was constructed in 1337 within the scope of the enlargement of Munich and the construction of the second city wall between 1285 and 1337 which was completed under the Emperor Louis IV. The gate first consisted of a 40 meter high main gate tower. Only with the construction of the moat wall of the gate tower the 2 flanking side towers were added and served as barbican.