Despite the name and its gloomy appearance, the devil has never resided in this 13th century castle. Over the ages it has been used as a residence for knights, an arsenal, a monastery, a school, an Episcopal school, and in 1623 the place became a place for the mentally ill and a home for male orphans Another part of the building was used as a prison or detention center, and the name is after a Belgian knight called Gerald the Devil, a distinguished historical symbol in the timeline of the city of Ghent.