Another important currency, used especially in western Greece, the "colts" of Corinth, took its type from the local myth that the winged horse Pegasos was captured by Bellerophon at the fountain Peirene, which flowed from the acropolis of the town (No. =30=; fig. 12_e_). The original punch-mark on the reverse was soon replaced by the helmeted head of Athena, who also had a part in the Pegasos myth, and these two types were constant as long as the Corinthian state existed. The money which enjoyed the fairest reputation was that of Athens, which, at the time of the Athenian empire, superseded the issues of the subject cities and became the standard currency in the Aegean Sea. It penetrated into the far East, and there are extant examples of native imitations from India and Arabia. The wide circulation of these staters among barbarous peoples was the cause of their peculiar style; for not only were the types of Athena's head and her owl and olive-branch unaltered from the first sixth-century design, but the execution was an imitation of the primitive manner, the stiffness of archaic art being reproduced in an affected archaism. As the money of Athens was the foremost in the Greek world, it is useful to note the extraordinary number of denominations which were struck in silver at its most flourishing period, the fifth century B.C. A large, but still not complete, series is exhibited here (No. =31=). It consists of the _Decadrachm_ (10 drachmae, fig. 12_f_), an early and rare coin, the _Tetradrachm_ (4 drachmae, fig. 12_g_), which was the famous Athenian stater or standard piece, the _Didrachm_ (2 drachmae), the _Drachm_ (fig. 12_h_), the unit of weight, which contained six obols, the _Triobol_ (3 obols), the _Diobol_ (2 obols), the _Obol_ (fig. 12_i_), the _Tritemorion_ (3/4 obol), the _Hemiobol_ (1/2 obol), the _Trihemitetartemorion_ (3/8 obol), and the _Tetartemorion_ (1/4 obol, fig. 12_k_), the half of the last piece being equivalent to the largest bronze coin, the _Chalkous_ (No. =32=). With the Athenian series is the bronze core of an ancient imitation of a silver stater, of which the silver plating has perished (No. =33=). False coining was punished with extreme penalties even in those early days: in an extant monetary convention between Mytilene and Phocaea, of the fourth century B.C., the crime of adulterating the money is threatened with death.[9]