Chillon Castle (www.chillon.ch/en) is the most famous castle in Switzerland. It enjoys a spectacular location on the eastern edge of Lake Geneva, near Montreux, with the Dents du Midi (literally meaning the Teeth of the South) mountains in the background. Built in the 13th century on Roman foundations, Lord Byron visited the chateau and later wrote the poem 'Prisoner of Chillon' (1816) about the fate of François de Bonivard (1493-1570). Bonivard was the castle's most famous prisoner, incarcerated between 1530 and 1536 for trying to bring protestantism to Switzerland. The castle was once an important medieval fort, strategically located on an island to guard against invasion. Today, visitors can see the castle's famous prison, and also tour the Grand Hall, the Hall of Justice, the Armouries, the Grand Hall of the Count and the Duke's Chamber and Saint George's Chapel.