A French castle owned by royals and a Rothschild is on the market for $454M — which would make it one of the most expensive homes ever sold

• A 12th-century French castle, Château d'Armainvilliers, is being auctioned for around $454 million.
• The castle was previously owned by King Hassan II of Morocco.
• It could be transformed as part of a new city development outside Paris.

A 12th-century castle that once belonged to a Rothschild is being auctioned for a staggering €425 million, or around $454 million.

Once sold, the castle and its grounds could be transformed into a new city development just outside Paris, a spokesperson for Ignace Meuwissen, a luxury real-estate agent who is handling the sale with his company Whisper Auctions, told Business Insider.