Coordinates: 47°51′38″N 12°23′53″E / 47.86056°N 12.39806°E
Herrenchiemsee is a complex of royal buildings on Herreninsel, an island in the Chiemsee, Bavaria's largest lake, 60 km south east of Munich. Together with the neighbouring island of Frauenchiemsee and the uninhabited Krautinsel it forms the municipality of Chiemsee.
After being purchased by King Ludwig II of Bavaria the former Herrenchiemsee monastery was converted into a royal residence known as the Old Palace (Altes Schloss), while the king built Herrenchiemsee Palace also known as the New Palace (Neues Schloss), the largest of his palaces.
According to tradition, the Benedictine abbey of Herrenchiemsee was established about 765 by Duke Tassilo III of Bavaria at the northern tip of the Herreninsel. New findings however indicate an even earlier foundation around 620/29 by the missionary Saint Eustace of Luxeuil.
In 969 Emperor Otto I consigned the abbey to the Archbishops of Salzburg, who in about 1130 re-established Herrenchiemsee as a monastery of Canons Regular living under the Augustinian rule. In 1215, with the approval of Pope Innocent III, Prince-Bishop Eberhard von Regensburg made the monastery church the cathedral of a diocese in its own right, the Bishopric of Chiemsee, including several parishes on the mainland and in Tyrol.