A reform of Diocletian made mint marks a regular feature of ancient Roman coinage. These mint marks were placed at the bottom of the reverse of the coin and contained three parts. The first part indicates that this was a coin with either SM for Sacra Moneta, M for Moneta, or P for Pecurnia. The second part was an abbreviation of the name of the mint such as ROM for Rome or LON for London. The final part indicated the workshop within the mint. The reform of Anastasius, which is the traditional dividing point between the coinage of the Roman and the Later Roman (a.k.a. Byzantine) empires, replaced the mint marks on gold coins by the inscription CONOB, meaning the pure standard of Constantinople, which was used by a variety of mints. Mint marks continued on copper coinage until the second half of the seventh century, however.