An Englishman’s home may be his castle but, with the threat of invasion by reivers and raiders diminished all over the world, historic fortresses are becoming homes.

Crenellations, keeps and barbicans conjure up a thrilling past while ancient interiors have been whipped into modern shape. Sixteen impossible-to-heat bedrooms might become eight cosy en suites. Dungeons have morphed into swimming pools and gyms. Here are some of the best castles on the market.

See the Portuguese one.