Common, scarce and rare Ancient Byzantine coins at Mintmark.com.
"BYZANTINE COINAGE—Byzantine currency, money used in the Eastern Roman Empire after the fall of the West, consisted of mainly two types of coins: the gold solidus and a variety of clearly valued bronze coins. By the end of the empire the currency was issued only in silver stavraton and minor copper coins with no gold issue. Iconography—Early Byzantine coins continue the late Roman conventions: on the obverse the head of the Emperor, now full face rather than in profile, and on the reverse, usually a Christian symbol such as the cross, or a Victory or an angel (the two tending to merge into one another). The gold coins of Justinian II departed from these stable conventions by putting a bust of Christ on the obverse, and a half or full-length portrait of the Emperor on the reverse. These innovations incidentally had the effect of leading the Islamic [Caliph] Abd al-Malik, who had previously copied Byzantine styles but replacing Christian symbols with Islamic equivalents, finally to develop a distinctive Islamic style, with only lettering on both sides. This was then used on nearly all Islamic coinage until the modern period. The type of Justinian II was revived after the end of Iconoclasm, and with variations remained the norm until the end of the Empire. In the 10th century so-called anonymous folles were struck instead of the earlier coins depicting the emperor. The anonymous folles featured the bust of Jesus on the obverse and the inscription XRISTUS/bASILEU/bASILE, which translates to Christ, King of Kings. Byzantine coins followed, and took to the furthest extreme, the tendency of precious metal coinage to get thinner and wider as time goes on. Late Byzantine gold coins became thin wafers that could be bent by hand. The Byzantine coinage had a prestige that lasted until near the end of the Empire. European rulers, once they once again started issuing their own coins, tended to follow a simplified version of Byzantine patterns, with full face ruler portraits on the obverse. Denominations—The start of what is viewed as Byzantine currency by numismatics began with the monetary reform of Anastasius [Anastasius I] in 498, who reformed the late Roman Empire coinage system which consisted of the gold solidus and the bronze nummi. The nummus was an extremely small bronze coin, at about 8-10 mm, weight of 0.56 making it at 276 to the Roman pound which was inconvenient because a large number of them were required even for small transactions. The new bronze coins called a follis weighed at 8.5 grs and were made from the multiple versions of this coin such as the 40 nummi (follis), 20 nummi, 10 nummi, and 5 nummi coins (other denominations were occasionally produced). The obverse (front) of these coins featured a highly stylized portrait of the emperor while the reverse (back) featured the value of the denomination represented according to the Greek numbering system (M = 40; K = 20; I = 10; E = 5) [q.v., Ancient Greek Coins]. Silver coins were rarely produced. The only (semi)regularly issued silver coin was the Miliaresion issued by Leo III [in Greek, Leon III] sometime between 717 and 741, and its double Hexagram first issued by Heraclius in 615 which lasted till the end of the 6th century, minted in varying fineness with a weight generally between 7.5 and 8.5 grams. The Miliaresion was minted as early as the 6th century, but seems most common in the seventh through ninth centuries. Small transactions were conducted with bronze coinage throughout this period. The golden solidus or nomisma remained a standard of international commerce until the eleventh century, when it began to be debased under successive emperors beginning in the 1030s under the emperor Romanos Argyros [Romanos III Argyros] (1028–1034). Until that time, the fineness of the gold remained consistent at about .955-.980. The Byzantine monetary system changed during the 7th century when the 40 nummi (also known as the follis), now significantly smaller, became the only bronze coin to be regularly issued. Although Justinian II (685–695 and 705–711) attempted a restoration of the follis size of Justinian I, the follis continued to slowly decrease in size. In the early ninth century, a three-fourths-weight solidus was issued in parallel with a full-weight solidus, both preserving the standard of fineness, under a failed plan to force the market to accept the underweight coins at the value of the full weight coins. The three-fourths weight coin was called a Tetarteron (a Greek comparative adjective, literally fourth-er), and the full weight solidus was called the Histamenon. The tetarteron was unpopular and was only sporadically reissued during the tenth century. The full weight solidus was struck at 72 to the Roman pound, roughly 4.48 grams in weight. There were also solidi of weight reduced by one siliqua issued for trade with the Near East. These reduced solidi, with a star both on obverse and reverse, weighed about 4.25 g. Abd al-Malik reformed the Islamic Dinar in 693, and issued gold coins of 4.25 g weight . . ." — Byzantine coinage at Wikipedia. Edited and (or) revised by Mintmark.com
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