1158 - which is the earliest date it was officially mentioned in a document - is regarded as the foundation date of Munich - although people - particularly Benedictine monks - settled down in the area much earlier.
Its origin is an argument between Bishop Otto of Freising and Henry the Lion, the Duke of Saxony and Bavaria, who destroyed an important Isar bridge of Otto for trading and built an own one (where the Ludwigsbrücke is now) in order to make profits from the trading with salt that was quite flourishing then. The argument was solved by the Emperor Frederick Barbarossa in Augsburg in 1158.