Byzantine coins are coins of the Byzantine Empire of Rome, which is sometimes called Romanion. During the late Roman empire, the coinage began to become smaller and more debased to the point where the bronze coinage were merely small pieces about the size of a pencil eraser. In 498 AD, the Byzantinian emperor Anastasius I reformed the coinage of Rome, and this event marks the turn from Roman Imperial to Byzantine in the ancient numismatic world. The coins are usually marked clearly for value, and almost always contained Christian iconography on them (usually Crosses). The new system was based on the Solidus (Gold) and the Follis (Bronze). The full folli were marked with a large "M" on the reverse, while 1/2 Folli were marked with a "K". Early coins bare the bust of the current emperor, while some later folles have a bust of Jesus Christ on them with usually a reverse that translates into "Christ, King of Kings". Later the Solidus would be debased and then replaced by the purer Hyperpyron. Byzantine coins are always written in Latin, however, when Europe slipped further into its Dark Age, this latin was not always written properly and can sometimes just look like random shapes. By 1400 AD, Byzantine coinage was so insignificant that the circulating coinage became the Italian Scyphate coins (cup shaped coins). The official end of the Byzantine Empire, and therefore its coinage, was in 1453.