A factor in this amalgamation of Erua and Sarpanitum was the close association brought about in Babylon between Marduk and a god whose seat was originally at the Persian Gulf--Ea. The cult of this god, as we shall see, survived in Babylonia through all political vicissitudes, and so did that of some other minor water-deities that belong to this region. Among these was Erua, whose worship centered in one of the islands in or near the gulf. Wisdom and the life-giving principle were two ideas associated in the Babylonian mind with water. As inferior in power to Ea, Erua appears to have been regarded as the daughter of Ea, and such was the sway exercised by Ea over men's minds, that even the Babylonian schoolmen did not venture to place Marduk over Ea, but pictured him as Ea's son. Erua, however, was not prominent enough to become Marduk's mother, and so she was regarded as his consort. In this capacity she was associated with Sarpanitum, and the two were merged into one personality. It rarely happens that all the links in such a process are preserved, but in this case, the epithets borne by Sarpanitum-Erua, such as 'lady of the deep,' 'mistress of the place where the fish dwell,' 'voice of the deep,' point the way towards the solution of the problem involved in the amalgamation of Erua and Sarpanitum.[126] Nabu. The god Nabu (or Nebo) enjoys a great popularity in the Babylonian cult, but he owes his prestige to the accident that, as god of Borsippa, he was associated with Marduk. Indeed, his case is a clear instance of the manner in which Marduk overshadows all his fellows. Only as they are brought into some manner of relationship with him do they secure a position in the pantheon during this second period of Babylonian history. Since Nabu's position in the pantheon, once established, incurs but little change, it will be proper, in treating of him, to include the testimony furnished by the historical records of the Assyrian kings. The most prominent attribute of Nabu, at least in the later phases of the Babylonian religion, is that of wisdom. He is the wise, the all-knowing. He embodies in his person all the wisdom of the gods. To him the Assyrian kings are particularly fond of ascribing, not merely the understanding that they possess, but the thought of preserving the wisdom of the past for future ages; and in doing this the Assyrians were but guided by examples furnished by the south. Wisdom being associated, in the minds of the Babylonians, with the watery deep, one is tempted to seek an aqueous origin for Nabu. Such a supposition, although it cannot be positively established, has much in its favor. It is not necessary, in order to maintain this proposition, to remove Nabu from Borsippa. The alluvial deposits made by the Euphrates yearly have already demonstrated that Babylon lay much nearer at one time to the Persian Gulf than it does at present. The original seat of Ea, whose worship continued