The Palace of the Grand Master of the Knights of Rhodes is a medieval castle located on the island of Rhodes, Greece. Originally constructed as a Byzantine fortress in the 7th century, it was converted in the 14th century to serve as the administrative center and residence of the Grand Master of the Knights Hospitaller. The palace features impressive fortifications including towers and thick walls, and has undergone periods of damage, reconstruction, and repurposing over the centuries under Byzantine, Knight, Ottoman, and Italian occupation and rule. It now operates as a museum exhibiting the history of Rhodes.