Right through the history of the Babylonian and Assyrian empires no monarch seems to have felt his tenure of power secure in Babylon until he had “taken the hand of Bel”--that is to say, that he had been adopted by the priesthood of “Bel” as the god’s son and representative. As our knowledge of Assyrian and Babylonian history grows clearer, it becomes plainer that the politics of that world, the revolutions, usurpations, changes of dynasty, intrigues with foreign powers, turned largely upon issues between the great wealthy priesthoods and the growing but still inadequate power of the monarchy. The king relied on his army, and this was usually a mercenary army of foreigners, speedily mutinous if there was no pay or plunder, and easily bribed. We have already noted the name of Sennacherib, the son of Sargon II, among the monarchs of the Assyrian Empire. Sennacherib was involved in a violent quarrel with the priesthood of Babylon; he never “took the hand of Bel”; and finally struck at that power by destroying altogether the holy part of the city of Babylon (691 B.C.) and removing the statue of Bel-Marduk to Assyria. He was assassinated by one of his sons, and his successor, Esarhaddon (his son, but not the son who was his assassin), found it expedient to restore Bel-Marduk and rebuild his temple, and make his peace with the god.[141] Assurbanipal (Greek, Sardanapalus), the son of this Esarhaddon, is a particularly interesting figure from this point of view of the relationship of priesthood and king. His father’s reconciliation with the priests of Bel-Marduk went so far that Sardanapalus was given a Babylonian instead of a military Assyrian education. He became a great collector of the clay documents of the past, and his library, which has been unearthed, is now the most precious source of historical material in the world. But for all his learning he kept his grip on the Assyrian army; he made a temporary conquest of Egypt, suppressed a rebellion in Babylon, and carried out a number of successful expeditions. As we have already told in Chapter XVI, he was almost the last of the Assyrian monarchs. The Aryan tribes, who knew more of war than of priestcraft, and particularly the Scythians, the Medes and Persians, had long been pressing upon Assyria from the north and north-east. The Medes and Persians formed an alliance with the nomadic Semitic Chaldeans of the south for the joint undoing of Assyria. Nineveh, the Assyrian capital, fell to these Aryans in 606 B.C.