of his decisions. A letter to his father indicates that Sennacherib respected him and that they were on friendly terms. He never disobeyed his father, and his letters indicate he knew Sargon well and wanted to please him. For unknown reasons, Sargon never took him on his military campaigns. Elayi believes that Sennacherib may have resented his father for this as he missed out on the glory attached to military victories. In any event, Sennacherib never took action against Sargon or attempted to usurp the throne despite being more than old enough to become king himself. Assyria and Babylonia By the time Sennacherib became king, the Neo-Assyrian Empire had been the dominant power in the Near East for over thirty years, chiefly due to its well-trained and large army superior to that of any other contemporary kingdom. Though Babylonia to the south had also once been a large kingdom, it was typically weaker than its northern neighbor during this period, due to internal divisions and the lack of a well-organized army. The population of Babylonia was divided into various ethnic groups with different priorities and ideals. Though old native Babylonians ruled most of the cities, such as Kish, Ur, Uruk, Borsippa, Nippur, and Babylon itself, Chaldean tribes led by chieftains who often squabbled with each other dominated most of the southernmost land. The Arameans lived on the fringes of settled land and were notorious for plundering surrounding territories. Because of the infighting of these three major groups, Babylonia often represented an appealing target for Assyrian campaigns. The two kingdoms had competed since the rise of the Middle Assyrian Empire in the 14th century BC, and in the 8th century BC, the Assyrians consistently gained the upper hand. Babylon's internal and external weakness led to its conquest by the Assyrian king Tiglath-Pileser III in 729 BC. During the expansion of Assyria into a major empire, the Assyrians had conquered various neighboring kingdoms, either annexing them as Assyrian provinces or turning them into vassal states. Because the Assyrians venerated the long history and culture of Babylon, it was preserved as a full kingdom, either ruled by an appointed client king, or by the Assyrian king in a personal union. The relationship between Assyria and Babylonia was similar to the relationship between Greece and Rome in later centuries; much of Assyria's culture, texts and traditions had been imported from the south. Assyria and