We must, therefore, proceed by inference. There are two or three recorded events earlier and later than our date, which are of service. First, we learn from Babylonian annals that Kyaxares, besides overrunning all Assyria and the northern part of Babylonia after the fall of Nineveh, took and pillaged Harran and its temple in north-west Mesopotamia. Now, from other records of Nabonidus, fourth in succession to Nebuchadnezzar, we shall learn further that this temple did not come into Babylonian hands till the middle of the following century. The reasonable inference is that it had remained since 606 B.C. in the power of the Medes, and that northern Mesopotamia, as well as Assyria, formed part of a loose-knit Median "Empire" for a full half century before 552 B.C. Secondly, Herodotus bears witness to a certain event which occurred about the year 585, in a region near enough to his own country for the fact to be sufficiently well known to him. He states that, after an expedition into Cappadocia and a war with Lydia, the Medes obtained, under a treaty with the latter which the king of Babylon and the prince of Cilicia promoted, the Halys river as a "scientific frontier" on the north-west. This statement leaves us in no doubt that previously the power of Ecbatana had been spread through Armenia into the old Hatti country of Cappadocia, as well as over all the north of Mesopotamia, in the widest sense of this vague term. Something more, perhaps, may be inferred legitimately from this same passage of Herodotus. The mediation of the two kings, so unexpectedly coupled, must surely mean that each stood to one of the two belligerents as friend and ally. If so (since a Babylonian king can hardly have held such a relation to distant Lydia, while the other prince might well have been its friend), Cilicia was probably outside the Median "sphere of influence," while Babylon fell within it; and Nebuchadnezzar--for he it must have been, when the date is considered, though Herodotus calls him by a name, Labynetus, otherwise unknown--was not a wholly independent ruler, though ruler doubtless of the first and greatest of the client states of Media. Perhaps that is why he has told us so little of expeditions and battles, and confined his records so narrowly to domestic events. If his armies marched only to do the bidding of an alien kinsman-in-law, he can have felt but a tepid pride in their achievements.