In addition to the vertical relations of class there were many horizontal relations between unrelated persons. There was a strong tradition of hospitality similar to the Greek "xenia". Many houses would have a "kunakskaya" or guest room. The duty of a host extended even to "abreks" or outlaws. Two men might be sworn brothers or "kunaks". There were brotherhoods of unrelated individuals called "tleuzh" who provided each other mutual support. It was common for a child to be raised by an "atalyk" or foster father. Criminal law was mainly concerned with reconciling the two parties. "Adyghe khabze" is sometimes called "adat" when it is contrasted to the kind of Islamic law advocated by people like Imam Shamil.