The Palais Princier is Monaco's royal palace. It was built in 1191 as a Genoese fortress, but by the end of the 13th century, it has become the home of the Grimaldi family. Every Grimaldi that ruled the country since then has added some parts to the building, so nowadays it is a little bit of a messy castle, made up of all sorts of architectural styles.

Since monaco was a small and weak country, the castle also had to be fortified, which contributed to way it looks. By the 18th century, the need for fortifications was somewhat relaxed and the French promptly seized it. They removed the treasures and exiled the Grimaldis and the castle fell into decline.

After the family was allowed to return, the palace was renovated to its former glory. The palace remains the residence of Monaco's current ruler.

The palace is located on the Rocher de Monaco.