An 11th Century city centre castle is going on the market this week.
The former law courts could be used as a hotel or casino
Rougemont Castle in Exeter is being sold by the Department for Constitutional Affairs. Bids must be submitted by 20 December.
The sale is being handled by Lambert Smith Hampton of Bristol, who said no guide price was being quoted. Sums of £1.5m have been mentioned locally.
The Devon castle was founded in 1066 by William the Conqueror on top of a volcanic hill.
Inside its high Norman walls and moat stands the Georgian buildings which, until a year ago, housed the city's Crown and County Courts.
Possible uses suggested for the castle have included a hotel, casino, tourist attraction or cultural site.