The coinage of the Seleucid Empire is based on the coins of Alexander the Great, which in turn were based on Athenian coinage of the Attic weight. Many mints and different issues are defined, with mainly base and silver coinage being in abundance. A large concentration of mints existed in the Seleucid Syria, as the Mediterranean parts of the empire were more reliant on coinage in economic function. The symbol of Seleucid power was the anchor, which was placed on the obverse of coins depicting Alexander posthumously. Some Seleucid bronze coinage feature decorative serrated edges similarly with certain Roman denarii and rare Macedonian coins. The first Seleucid royal mint was at Seleucia on the Tigris. Antioch, as a new capital, did have the most important mint after Seleucus I moved mint workers there from Seleucia. Denominations Bronze coinage was issued in five denominations; the weight and size varies greatly and most likely no effort was made to conform to a set standard, they may be denominated in chalkoi. A size = 23+ mm = 10+ g B size = 18–23 mm = 6.77–8.63 g C size = 13–17 mm = 3.88 g D size = 12–13 mm = 1.59 g E size = 10–12 mm = 1.13 g The denomination values and common imagery on silver coinage was as follows, with the denomination based on the Obol and image most common on the coin: 1 Obol: Anchor and Bow and Quiver. 2 Diobol: Bow and Quiver 3 Hemidrachm: 6 Drachm: Anchor 24 Tetradrachm: Elephant walking Coins with the head of Zeus on the reverse and Athena in elephant car. These coins are of a lighter Phoenician standard. History Successor states of the Macedonian Empire continued to mint coins with image of Alexander the Great. Such coins were widespread within the Seleucid Empire, as all mints except the one in Bactra struck them. Antiochus I, son of Seleucus I, was the first Seleucid ruler to strike coins with his own image on them. Typically, coins which were not based on Attic weight, did not circulate within the empire. Attalid, Ptolemaic and Rhodian coins were using a different standard. Regulations may have existed to enforce usage of the Attic standard. However, the regulations were probably made for practical reasons rather than being politically motivated. Coele-Syria and Phoenicia were exceptions to the rule of using the Attic standard. They were conquered by Antiochus