My goal was Ctesiphon (Fig. 107). The huge fragment of the palace, which is all that remains of the Sassanian capital, successor and heir to Seleucia, lies about half-a-mile from the river on the edge of a reed-grown marsh. No more of it is standing than the central vaulted hall (and here half the vault has fallen) and the east wall of one of the wings (Fig. 108). The second wing has disappeared, and nothing is left of the rooms on either side of the hall[88] (Fig. 109). Even in this condition Ctesiphon is the most remarkable of all known Sassanian buildings and one of the most imposing ruins in the world. The great curtain of wall, the face of the right wing, rises stark and gaunt out of the desert, bearing upon its surface a shallow decoration of niches and engaged columns which is the final word in the Asiatic treatment of wall spaces, the end of the long history of artistic endeavour which began with the Babylonians and was quickened into fresh vigour by the Greeks. Tradition has it that the whole wall was covered with precious metals. The gigantic vault, built over empty space without the use of centering beams, is one of the most stupendous creations of any age. It spans 25·80 metres: the barrel vaults of the basilica of Maxentius in the Roman Forum span 23·50 metres; the barrel vault that covered the aula of Domitian’s palace on the Palatine spanned 30·40 metres, but it has fallen. The Roman vaults were built over centering beams, not over space on the Mesopotamian system, and the latter, what with the appeal which it makes to the imagination and the high ovoid curve which it involves, gives a result incomparably more impressive. In this hall Chosroes held his court. It must have lain open to the rising sun, or perhaps the entrance was sheltered by a curtain which hung from the top of the vault down to the floor. The Arab historian, Ṭabarî, gives an account of a carpet seventy cubits long and sixty cubits broad which formed part of the booty when the Mohammadans sacked the city. It was woven into the likeness of a garden; the ground was worked in gold and the paths in silver; the meadows were of emeralds and the streams of pearls; the trees, flowers and fruits of diamonds and other precious stones. Such a texture as this may have been drawn aside to reveal the Great King seated in state in his hall of audience, with the light of a thousand lamps, suspended from the roof, catching his jewelled tiara, his sword and girdle, illuminating the hangings on the walls and the robes and trappings of the army of courtiers who stood round the throne. The pages of the historian who relates the Mohammadan conquest of Ctesiphon ring still with the triumph of that victory. The Sassanian capital comprised both the old Greek [Illustration: FIG. 107.--CTESIPHON, FROM EAST.] [Illustration: FIG. 108.--CTESIPHON, FROM WEST.] [Illustration: FIG. 109.--CTESIPHON, REMAINS OF VAULT ON WEST SIDE OF SOUTH WING.]