Under this title we may group the Palace, the Public Baths, the Basilica, the Market, the Theatre, the Hippodrome, the Naumachia, and the remains of one or two buildings of unknown purpose. A Greek theatre might be classified as a religious building; but in Roman times the theatre became more and more of a civic, and perhaps . less of a religious building. Among the edifices enumerated above, the Theatre is the only one that has received more than passing mention, and many have not been noticed at all by the numerous explorers and travellers who have visited Bosra. From the point of view of the history of architecture, some of these buildings are more important than those which have been the object of more thorough examination ; for they represent classes of structures which are less commonly found among the ruins of ancient cities.