Is it a palace? A glance at the plan is enough to prove that it does not fall precisely within the four corners of the scheme to which Khusrau’s palace belongs. This divergence of plan, and the peculiar character imparted to the ruins by the isolated quadrangular chamber which dominates the whole complex, have led to the suggestion that Chehâr Qapû may have been a fire temple. In support of this view two buildings have been cited, the rectangular western annex at Hatra, and a ruin excavated by Dieulafoy at Susa. The last-named instance carries little weight.[161] Its resemblance to Hatra depends upon the reconstruction proposed by Dieulafoy upon data too slight to be convincing. Until a further examination has been made, the ruin at Susa offers too frail a substructure for the lightest of theories. As regards Hatra (Fig. 10), the western annex blocks a window in one of the smaller rooms of the south lîwân and is therefore certainly a later addition. But the learned author of the Deutsche Orient-Gesellschaft publication has given us two plans of smaller palaces, found among the ruins in the city, of which one certainly, and the other probably, is composed of a lîwân with its flanking chambers, and a posterior rectangular room with, however, the interposition of a narrow latitudinal room between them (Fig. 18). Dr. Andrae has pointed out that while a lîwân group combined with a rectangular chamber, but without a latitudinal chamber, exists in the main palace (south lîwân), two lîwâns with a latitudinal chamber but without the rectangular chamber are found in the northern annex, which, like the western annex, is a later addition to the palace. The fact that the dispositions observed in the main palace are not entirely isolated examples is of the highest significance, but it does not solve the problem connected with the so-called ‘temple’. In all these palaces the posterior quadrangular chamber may have been a sanctuary, or it may equally well have been a living-room. The theory that in the main palace it is indeed a sanctuary rests mainly upon the symbolic representations carved upon the lintel of one of its doorways.[162] The motives there used are familiar elements of Parthian decoration. The dragon occurs upon the façade of Hatra itself and was found by Loftus among the Parthian fragments at Warka,[163] as well as upon a lintel excavated by George Smith at Quyundjik,[164] but there is no saying whether the lintel belonged to a sanctuary or to a private dwelling. Nor is there much to be learnt, with regard to fire temples, from literary sources. Herodotus declares that it was not the practice of the Persians [Illustration: FIG. 18. Small palace at Hatra. (From _Hatra_, by kind permission of the D. Orient-Gesellschaft.)]