 This was especially so when it involved the sale of Christians to non-Christians, which was often forbidden (for these purposes the Eastern Orthodox might not always be regarded as Christian).The export of Christian slaves to non-Christian lands was often prohibited, for example at the Council of Koblenz in 922, and the Council of London (1102).The ownership of slaves was not condemned in the same way, except that Jews, typically the only non-Christian group accepted in medieval Christian societies, were forbidden to own Christian slaves.