Although "castle" has not become a generic term for a manor house (like château in French and Schloss in German), many manor houses contain "castle" in their name while having few if any of the architectural characteristics, usually as their owners liked to maintain a link to the past and felt the term "castle" was a masculine expression of their power. In scholarship the castle, as defined above, is generally accepted as a coherent concept, originating in Europe and later spreading to parts of the Middle East, where they were introduced by European Crusaders. This coherent group shared a common origin, dealt with a particular mode of warfare, and exchanged influences.