In order to find a king to whom we can give a probable date we have to come down as far as Ismi-Dagan, who should figure in the fourth dynasty of Berosus. Tiglath-Pileser the First, who reigned in Assyria at the end of the twelfth century, has left us an official document in which he recounts how he had restored in Ellasar (now _Kaleh-Shergat_), a temple of Oannes founded by Ismi-Dagan seven hundred years before. We are led therefore to place the latter king about 1800.[64] We learn at the same time that Assyria was inhabited, in the days of Ismi-Dagan, by a people who borrowed their gods from Chaldaea, and were dependents of the sovereign of the latter country. It was in fact upon the shores of the Persian Gulf, far enough from Assyria, that Oannes made his first revelation, and it is at Ur in the same region that the names of Ismi-Dagan and of his sons Goun-goun and Samsibin are to be found stamped upon the bricks. We may, therefore, look upon their epoch as that in which the first Chaldee Empire reached its apogee. It then embraced all Mesopotamia, from the slopes of Mount Zagros to the out-fall of the two great rivers. The sovereigns of Chaldaea, like the Pharaohs of Egypt, toiled with intelligence and unremitting perseverance to develop the resources of the vast domain of which they found themselves masters. They set on foot great public works whose memory survives here and there, to this day. From the moment when the first colonists, of whatever race, appeared in the country, they must have set about regulating the water courses; they must have taken measures to profit by the floods to form reserves, and to utilize the natural fall of the land, slight though it was, for the distribution of the fertilizing liquid. The first groups of agriculturists were established in the immediate neighbourhood of the Tigris and Euphrates, where nothing more was required for the irrigation of the fields than a few channels cut through the banks of the stream, but when the time arrived for the settlement of the regions at some distance from both rivers, more elaborate measures had to be taken; a systematic plan had to be devised and carried out by concerted action. That the kings of Chaldaea were quite equal to the task thus laid upon them is proved by the inscriptions of HAMMOURABI, one of the successors of Ismi-Dagan, which have been translated and commented upon by M. Joachim Menant.[65]