It now remains to sum up the conclusions reached with regard to the origin of ḥîrah and bâdiyah on either side of the desert. And first it is clear that Ukhaiḍir stands in the closest relations to the Syrian group, not only in general conception, but in details of construction. But Ukhaiḍir reflects the older Lakhmid ḥîrahs, those palaces that were supposed to represent an army in battle with two wings, and through them it re-echoes the Sasanian palaces which were contemporary with them. These too, as we know from the palace of Khusrau at Qaṣr-i-Shîrîn, were composed of a centre and two wings. Again, allowance must be made for Byzantine influence in the Sasanian palaces and the Lakhmid ḥîrahs. Justinian lent artificers to Khusrau I; Khawarnaq was built by a Greek. The intercourse, friendly and unfriendly, between the Sasanian and the Byzantine empires was unbroken. When it was friendly it took the form of commerce, and architects were among the exchangeable commodities; when it was unfriendly it took the form of prisoners of war. Khusrau I must have captured a large and varied selection of artificers when he removed the whole population of Antioch to Seleucia. It is improbable that they should have sat idle in their new abode. They exercised their crafts, and they exercised them in their own manner. It may well have become the fashion among the citizens of Ctesiphon to shop in the Greek Bazaar, just as the citizens of Damascus shop in the Greek Bazaar of their own town. Greek influence, as we know, did not begin with Justinian. It began with a mightier figure than that of the imperial lawgiver--with the mightiest of all, with Alexander. I have already shown that the Mohammadan lîwân took to itself a part of the Greek peristyle and uses it still under the name of ṭarmah. Who can tell when this process began? The Greek peristyle exists in a Parthian palace at Niffer and in Parthian houses at Babylon. Hatra fronts the desert with a Hellenistic façade; so does Ctesiphon; it adorns the central court of Ukhaiḍir. But that Byzantine or earlier Western influence affected in any fundamental manner the plan of palace or ḥîrah is not borne out by this evidence. No fundamental change can be observed at any time, but on the contrary a steady, continuous growth of oriental methods, on oriental lines, and a steady development based on developing needs, ceremonial and social. From the days of the Hittites the palace was composed of a centre and two wings. The khilâni palaces of Zindjirli were laid out on a small scale; the khilâni palaces of Pasargadae and Persepolis covered a wide area, but provided little better accommodation; for the courtiers and guards were lodged elsewhere, in buildings of a less permanent character. Persepolis was the capital of an empire; all the needs of the time were fulfilled there. But this is not the case at Firûzâbâd and Sarvistân. Of the capital seats of the Sasanian kings we know but two,