The earliest of the quay-walls, which is also the earliest building yet recovered on the Ḳaṣr, is the most massive of the four,[43] and is strengthened at the angle with a projecting circular bastion. It is the work of Sargon of Assyria,[44] who states the object of the structure in a text inscribed upon several of its bricks. After reciting his own name and titles, he declares that it was his desire to rebuild Imgur-Bêl; that with this object he caused burnt-bricks to be fashioned, and built a quay-wall with pitch and bitumen in the depth of the water from beside the Ishtar Gate to the bank of the Euphrates; and he adds that he "founded Imgur-Bêl and Nimitti-Bêl mountain-high upon it."[45] The two walls of Sargon, which he here definitely names as Imgur-Bêl and Nimitti-Bêl, were probably of crude brick, and were, no doubt, demolished and replaced by the later structures of Nabopolassar's and Nebuchadnezzar's reigns. But they must have occupied approximately the same position as the two crude brick walls above the quay of Sargon,[46] which run from the old bank of the Euphrates to the Ishtar Gate, precisely the two points mentioned in Sargon's text. His evidence is therefore strongly in favour of identifying these later crude-brick walls, which we have already connected with the inner city-wall, as the direct successors of his Imgur-Bêl and his Nimitti-Bêl, and therefore as inheritors of the ancient names. [Illustration: FIG. 8. SECTION OF THE QUAY-WALLS AND FORTIFICATION-WALLS ALONG THE NORTH FRONT OF THE SOUTHERN CITADEL. A: Sargon's quay-wall. B: Older moat-wall. O: Later moat-wall of Nebuchadnezzar. D: Intermediate wall. E: South fortification-wall of crude brick, probably Imgur-Bêl. F: North fortification-wall of crude brick, probably Nimitti-Bêl. G: North wall of Southern Citadel. H: Remains of older crude brick wall. (After Andrae.)]