Meanwhile the great kingdom of the Hittites at Boghaz Koi had entered upon its era of expansion under Subbiluliuma, who pushed his conquests first eastward and then southward. Dushratta feared to meet the Hittite in battle and retired to the eastward, allowing much of his country to be overrun. This land Subbiluliuma gave to one of his allies, and Dushratta was murdered soon afterward by his son, Sutatarra, who usurped the crown. Soon after this the Assyrians invaded the lands of the Mitanni from the east, and the land, already distracted by its internal divisions, was thrown into a worse confusion. At this juncture Subbiluliuma crossed the Euphrates again and entered Mitannian territory. He was accompanied by settlers who brought cattle, sheep, and horses to remain in the country. Advised by an oracle, he deposed Sutatarra and placed upon the throne Mattiuaza, a son of Dushratta, who had been heir-apparent and who had fled when his father was murdered. To Mattiuaza Subbiluliuma gave his daughter in marriage, and Mitanni became a vassal state of the Hittite realm. After this our sources tell us no more of its history. Near the Mitanni were the Harri, who were probably of the same race, for in the time of Subbiluliuma they were ruled first by Artatama II, a brother of Dushratta, and then by Sutarna II. This state also became a part of Subbiluliuma’s kingdom. (4) _Kingdom of “Hittite City.”_--The wave of migration from the northeast which brought the Mitanni into upper Mesopotamia had swept on westward into Cappadocia, where the greatest Hittite state afterward developed. The monuments erected by the Hittites were nearly all of a religious character. In the earlier time they wrote few historical inscriptions. Such inscriptions as we have in Hittite hieroglyphs seem to come from the later periods and to record alliances. It is probable that in the development of the Hittite state in Cappadocia first one city and then another had the upper hand. The Hittite monuments at Eyuk are of a more primitive character than those at Boghaz Koi, and it is natural to suppose that a Hittite state flourished here before the rise of the one at Boghaz Koi. Be that as it may, the most powerful Hittite monarchy of which we know arose at Boghaz Koi, which they called “Hittite City.” This monarchy emerged about 1400 B. C. Its first king was Hattusil I, of whom we know no more than that he was the founder of the great dynasty which ruled from the “Hittite City” for two hundred years.