The infobox lists Guy of Thouars, Duke of Brittany, as the builder. It was built in 1207 and rebuilt in 1466. The article calls it a fortified château, with no further style, materials or architect. Its ramparts include a 500-meter (1,640 ft) round walk. It was the center of Brittany until the province's separation.
Restoration and repairs began in the 1990s and took 15 years. The site closed for three years and reopened on February 9, 2007. Night-time illumination was added.
The city of Nantes owns it. The Nantes History Museum occupies 32 rooms, and the site is open to the public. It has been a monument historique since 1840. The museum halted a Genghis Khan exhibition after requests from the Chinese government.

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