In the currency of ancient Rome, the bigatus (plural bigati) is a type of denarius stamped on the reverse with a biga, a two-horse chariot. It began to appear in the first decade of the 2nd century BC as an alternative to the victoriatus, and most numismatists believe that it was not used before 190 BC. A denarius with a four-horse chariot (quadriga) had already been in use for some time; see quadrigatus, likewise named for its chariot icon and depicting in addition the Dioscuri.