According to Pollux then the Attic didrachm, or at least a coin employed by the Athenians (perhaps certain coins of Euboea), was called an ‘ox.’ Plutarch (_Theseus_, c. 25) goes further and asserts that Theseus struck money stamped with the figure of an ox (ἔκοψε δὲ νὸμισμα βοῦν ἐγχαράξας), and the Scholiast on the _Birds_ of Aristophanes (1106) quotes from Philochorus, an Athenian antiquary of the third century B.C.[8], the same account of the Attic didrachms being marked with an ox. On the other hand the highest authorities on numismatics assert that the Athenians never struck any such coins. Yet after making due allowance for the additions made by Plutarch to the more crude statement of Pollux and Philochorus, it is hard to conceive that such a belief could have arisen without some foundation, and a probable solution may be found in the fact that certain uninscribed coins, bearing the type of an ox-head, which in recent years have been assigned to Euboea, are for the most part found in Attica. We know that Eretria, and Chalcis, the great cities of Euboea, were amongst the earliest places in Greece to strike money, and it is quite possible, nay probable, that these Euboic coins formed (along with the Aeginetan didrachms) the currency in use at Athens before the time of Solon (B.C. 596). Why the name _ox_ was especially recollected in after years as that of the earliest currency, we can readily understand; the name derived from the old unit of barter would at once attach itself to the coin which bore the image of the ox, and in the course of time two traditions, one that the ancient unit was the ox, the other that the first coins current at Athens bore the symbol of an ox, would merge into one, and finally patriotic feeling would ascribe the first coinage to Theseus, who was regarded as the father of so many Athenian institutions.