Frauenchiemsee Monastery was founded by Duke Tassilo, and the monastery church was consecrated in 782 by Bishop Virgil of Salzburg. In 788 the monastery came into the possession of Charles the Great, and passed from him to his grandson Ludwig the German. The foundations of the church, and possibly also parts of the walls, probably originate from the Carolingian era. The present church was already in existence in the 11th century. In the 12th and 13th centuries it was extended and rebuilt. The appearance of the interior was significantly altered by the addition of a ribbed vault in 1468-1476, and the baroque altars were added in 1688-1702. The bell tower, situated in front of the northwest side of the church, became the symbol of the Chiemgau. The two lower floors of this eight-sided tower probably date from the 12th century, while the upper one was added in 1395. The tower acquired its characteristic onion dome in 1626. It was not part of the original monastery complex, but was built on the foundations of what was probably a Carolingian building. Fraueninsel Cemetery has a cenotaph of Alfred Jodl, Chief of the Operations Staff of the Armed Forces High Command (Oberkommando der Wehrmacht, or OKW) during World War II, despite the fact that he has been executed as a war criminal and his body had been cremated and ashes scattered into a small river in the Munich area.