The Royal Castle (Polish: Zamek Krolewski) in Warsaw was the royal palace and official residence of the Polish monarchs, located at The Castle Square (Plac Zamkowy), at the entrance to The Old Town. The personal offices of the king and the administrative offices of the Royal Court of Poland were located there from the 16th century until the Partitions of Poland. In the 19th century, after the collapse of the November Uprising, it was used as an administrative center by the tzar. During the First World War it was the residence of the German military governor, and from 1920 to 1922, the residence of head of state. Between 1926 and World War II the palace was the seat of the Polish president, Ignacy Moscicki. After the devastation of World War II it was rebuilt and reconstructed. Today it is a historical and national monument, and is listed as a national museum.