weight rather than number. Analysis of the siliquae suggests a range of fineness of between 95% and 99% silver, with the highest percentage of silver found just after a reform of the coinage in 368. Of the siliquae, 428 are locally produced imitations, generally of high quality and with as much silver as the official siliquae of the period. However, a handful are cliché forgeries where a core of base metal has been wrapped in silver foil. Historical spread and minting Coins are the only items in the Hoxne Hoard for which a definite date and place of manufacture can be established. All of the gold coins, and many of the silver coins, bear the names and portraits of the emperor in whose reign they were minted. Most also retain the original mint marks that identify where they were minted, illustrating the Roman system of regional mints producing coins to a uniform design. The coins' manufacture has been traced back to a total of 14 sources: Trier, Arles and Lyon (in Gaul), Ravenna, Milan, Aquileia, Rome (in modern Italy); Siscia (modern Croatia), Sirmium (modern Serbia), Thessaloniki (Greece), Constantinople, Cyzicus, Nicomedia, and Antioch (modern Turkey). The coins were minted under three dynasties of Roman emperors. The earliest are the successors of the Constantinian dynasty, followed by the Valentinianic emperors, and finally the Theodosian emperors. The collegiate system of rule (or Consortium imperii) meant that imperial partners would mint coins in each other's names at the mints under their jurisdiction. The overlapping reigns of Eastern and Western emperors often allow changes of type to be dated to within part of a reign. So the latest coins in the hoard, of Western ruler Honorius (393–423) and his challenger Constantine III (407–11), can be demonstrated to belong to the earlier parts of their reigns as they correspond to the lifetime of the Eastern Emperor Arcadius, who died in 408. Thus, the coins provide a terminus post quem or earliest possible date for the deposition of the hoard of 408. The siliquae in the Hoard were struck mainly at Western mints in Gaul and Italy. It is unknown whether this is because coins from further East rarely reached Britain through trade, or because the Eastern mints rarely struck siliquae. The production of coins seems to follow the location of the Imperial court at the time; for instance, the concentration of Trier coins is much greater