Trajan Sestertius, RIC II Trajan 558

Monetary Context and Denominational Role

Under the Principate, the sestertius served as the flagship brass denomination of the Roman monetary system, holding a tariff of one quarter of a silver denarius or four copper asses. Manufactured from orichalcum, a golden-toned copper-zinc alloy, the sestertius provided a wide surface flan that imperial authorities routinely exploited for intricate artistic displays and public ideological messaging. During Trajan's reign, vast amounts of Dacian bullion flowed into Rome following the campaigns of AD 101 to 102 and AD 105 to 106, prompting a substantial overhaul of the coinage, broad monetary reform, and extensive public building programs. In this active fiscal environment, RIC II Trajan 558 represented a prominent medium of bronze circulation, combining high monetary purchasing power in daily commercial transactions with imperial victory celebration.

Production Standards and Mint Attribution

RIC II Trajan 558 was struck exclusively at the principal imperial mint in Rome. Die cutters of the central mint in this period worked with high technical skill, cutting deep dies designed to strike heavy flans of orichalcum under high striking pressure. Sestertii of Trajan's fifth consulship typically maintain an intended weight standard clustered around 25.0 to 28.0 grams, with typical diameters ranging between 32 and 35 millimeters, although individual planchets vary due to ancient casting tolerances and mechanical trimming. Striking required multiple laborers swinging heavy hammers upon heated or annealed blanks, resulting in distinctive beveling and occasional planchet cracks around the perimeter. Die axes for this series are predominantly regular, oriented to either six o'clock or twelve o'clock, reflecting the disciplined internal standards of the Trajanic mint ateliers.

Obverse Design and Portraiture

The obverse of RIC II Trajan 558 features an authoritative bust of Trajan facing right. He is rendered with a laurel wreath whose ties hang behind his neck, accompanied by drapery across his shoulders and an aegis, an attribute associated with Jupiter and Minerva symbolizing divine protection. The portrait reflects the idealized realism characteristic of Trajan's middle coinage: a strong, square jaw, straight nose, and combed-forward hair across the brow, projecting military vigor and sober civic discipline. The surrounding inscription, IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P, opens from the lower left and encircles the portrait, systematically listing his imperial lineage, victory titles, and constitutional magistracies.

Reverse Iconography: Tiber and Dacia

The reverse iconography of RIC II Trajan 558 presents an allegorical tableau of military conquest. The river god Tiber stands facing left, his body dynamically engaged as he presses the personification of Dacia down toward the earth, pinning her beneath his right knee. Dacia is depicted in distress or supplication, symbolizing the total submission of the Dacian kingdom to Roman authority. By employing the Tiber, the foundational river of Rome, as the active conqueror rather than Mars or Trajan himself, the composition frames the victory as a structural triumph of the Roman state and its eternal domain over northern barbarian resistance. The field bears the letters S C (Senatus Consulto), confirming the formal senatorial decree authorizing the production of bronze coinage.

Epigraphy and Imperial Titulature

The obverse legend reads IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P, which abbreviates Imperatori Caesari Nervae Traiano Augusto Germanico Dacico, Pontifici Maximo, Tribunicia Potestate, Consuli Quintum, Patri Patriae. This epigraphic formula dedicates the coinage in the dative case to Trajan, honoring his adoption by Nerva, his Germanic and Dacian triumphs, his position as supreme pontiff, his tribunician power, his fifth consulship, and his status as Father of the Country. The reverse legend, S P Q R OPTIMO PRINCIPI, translates as The Senate and People of Rome to the Best of Princes. Bestowed by the Senate, the title Optimus Princeps was heavily emphasized on Trajan's bronze and silver issues after AD 103, underscoring civil harmony and legitimate authority.

Typological Classification and Chronological Placement

In the standard reference work Roman Imperial Coinage, this specific reverse composition is catalogued as RIC II 558, situated within the extensive series sharing the COS V dating formula. In Bernhard Woytek's comprehensive monograph Die Reichsprägung des Kaisers Traianus (MIR 14), the issue is integrated into the precise emission sequences of Trajan's middle reign. Because Trajan entered his fifth consulship on January 1, AD 103, and did not assume his sixth until January 1, AD 112, coins bearing COS V span nearly a decade. The Dacian titles and motifs on RIC II Trajan 558 place its introduction in or shortly after AD 103, remaining in production across subsequent emission phases up to approximately AD 111 as Rome consolidated the newly formed province of Dacia.

Circulation Patterns and Archaeological Recovery

As base-metal currency with high individual purchasing power, Trajanic sestertii circulated extensively across Italy and the western provinces, including Gaul, Hispania, Britannia, and along the Rhine-Danube military frontiers. Archaeological evidence from hoards and urban excavations indicates that sestertii of the Optimus Princeps series experienced prolonged use, remaining in circulation through the Antonine and Severan eras. Due to decades of wear and handling, many surviving specimens exhibit significant surface smoothing, softening the relief of the complex reverse group. The Tiber and Dacia type remains one of the more specialized historical allegories within the broad COS V sestertius repertoire, illustrating the enduring circulation of Dacian victory imagery throughout the Roman world.

References

1. Coins of the Roman Empire in the British Museum, Vol. III: Nerva to Hadrian. Trajan, Sestertii of the Fifth Consulship
2. The Roman Imperial Coinage, Vol. II: Vespasian to Hadrian. pp. 283-284, no. 558
3. RIC II Trajan 558 in Online Coins of the Roman Empire. ric.2.tr.558
4. Die Reichsprägung des Kaisers Traianus (98-117) (MIR 14). Moneta Imperii Romani 14