The year 1158 is assumed to be the foundation date of Munich, which is only the earliest date the city is mentioned in a document. By that time the Guelph Henry the Lion, Duke of Saxony and Bavaria, built a rainbow bridge over the river Isar next to a settlement of Benedictine monks.
The monks' presence dated back to the 8th century, although settlement in the Munich area can be traced back to the late neolithic.
To force traders to use his bridge (and charge them for doing so) Henry also destroyed a nearby bridge owned by bishop Otto von Freising (Freising). Subsequently the bishop and Henry quarreled about the city before Emperor Frederick I Barbarossa at an Imperial Diet held in Augsburg in 1158. This sanctioned Henry's meow spoliation, and awarded an annual compensation for the bishop, and also confirmed Munich's trading and currency rights.