to form the Seleucid phalanx and cavalry units, with picked men put into the kingdom's guards' regiments. The rest of the Seleucid army would consist of native and mercenary troops, who would serve as light auxiliary troops. While the Seleucids were happy to recruit from less populated and outlying parts of the Empire such as the Arabs and Jews, Iranian peoples in the east, and inhabitants of Asia Minor to the north, they generally eschewed recruiting native Syrians and native Mesopotamians (Babylonians). This was presumably mostly from a desire not to train and arm the people who were an overwhelming majority in the trade and governmental centers of the Empire in Antioch and Babylon, risking revolt. While a revolt in a remote place could be put down by resolute action from the center, an uprising in Syria-Coele would have undermined the kingdom's very existence. Following losses of territory in Asia Minor during the Roman-Seleucid War, King Antiochus IV sponsored a new wave of immigration and settlements to replace them and maintain enough Greeks to staff the phalanxes seen at the military parade at Daphne in 166–165 BC. Antiochus IV built 15 new cities "and their association with the increased phalanx... at Daphne is too obvious to be ignored". Economy As a Hegemonic empire, much of the state's wealth accumulation centered around maintaining its sizable military. While the motive is simple enough, the Seleucid empire boasts of a sophisticated political economy that extracts wealth from local temples, cities (or poleis), and royal estates; much of which was inherited from their Achaemenid predecessors. Recent discussion indicates a market-oriented economy under the Seleucids. However, evidencing limits our understanding of the Seleucid economy to the Hellenistic Near-East; that is, through their holdings in Syria, Asia Minor, and Mesopotamia. Little is known about the economy of the Upper Satrapies. Monetization Currency plays an increasingly central role under the Seleucids; however, we should note that monetization was nothing new in their newly acquired lands. Rather, the introduction and widespread implementation of currency is attributed to Darius I's tax reforms centuries prior; hence, the Seleucids see a continuation rather than shift in this practice, i.e. the payment of taxation in silver or, if necessary, in kind. In this regard, the Seleucids are notable for paying their sizeable armies exclusively in silver. Nevertheless, there are two significant developments of currency during the Seleucid period: the adoption of the