Many etymologies, most of them fanciful, have been given of the name Bagdad. It is said that when Al-Mansur finally selected the site for his capital he found it occupied by several monasteries, most of them Nestorian, and that the capital derived its appellation from the Arabic word _bagh_--garden,--and _Dad_--the name of a certain monk who had a garden there. Others aver that the name is derived from two Persian words, _Bagh_--God,--and _Dadh_--founded--signifying a city founded by God. The official name, however, given, we are told by the Caliph Al-Mansur himself, was Medina-as-Salam, which signifies the “City of Peace.” But among the Saracens it was more generally known as Dar-as-Salam, which also signifies City or Home of Peace. The Greeks gave it a name--Eirenopolis--which is a literal translation of the Arabic Dar-as-Salam. But it is by the older and more common name--Bagdad--which is variously spelt--that the city of Al-Mansur has generally been known from its foundation to the present day. It was long thought that the capital of the Caliphs had been founded on ground which had not previously been occupied by a dense population. But a discovery made in 1848 by Sir Henry Rawlinson, when the waters of the Tigris were exceptionally low, disclosed the surprising fact that Al-Mansur had founded his capital on the site of a city that antedated the Christian era by at least seven centuries. An extensive facing of brickwork, which still exists, was then found to line the western bank of the river, and each brick of this facing bore the name and titles of Nebuchadnezzar. No less remarkable, in this connection, is a later discovery in the Assyrian geographical catalogues, belonging to the reign of Asurbanipal, of a name very similar to Bagdad “which probably refers to the town then standing on the site afterwards occupied by the capital of the Caliphs.” Al-Mansur founded his capital, known from its peculiar form as “The Round City,” on the right bank of the Tigris, but it was not long until the palaces of the Caliphs and the government offices were transferred to the eastern side of the river, where the capital has since remained, while the part of the city on the western bank, especially the quarter called Karkh, was given over to markets and merchants, where “every merchant and each merchandise had an appointed street: and there were rows of shops, and of booths and of courts in each of the streets; but men of one business were not mixed up with those of another, nor one merchandise with merchandise of another sort. Goods of a kind were only sold with their kind, and men of one trade were not to be found except with their fellows of the same craft. Thus each market was kept single and the merchants were divided according to their merchandise, each craftsman being separated from others not of his own class.”[426]