(note: automatic translation; please, allow few days to review it)
The siliqua appeared as new silver coin following the monetary reform of Costantino.
Besides the silqua, his double was introduced, called miliarense, that has almost regularly been the only silver coin wisecrack at the Byzantine Emperors. You/he/she was coined beginning from the sixth century with a weight between 7,5 and 8,5 grams, but more commune has become since seventh one to the ninth century. The light miliarense and the heavy miliarense and a solid existed it was worth 14 heavy miliarensis or 18 light miliarensis.
