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Home ▸ Catalog ▸ |Themes & Provenance| ▸ |Numismatics| ▸ |Coded||View Options:  |  |  | 

The Roman "Secret" Codeword Coins

Some Roman antoniniani offer a unique and very interesting collecting focus - the embedded "secret" codeword series of Probus, Diocletian, and Maximian. Each of these coins was struck with the letters of a codeword "hidden" within the mintmark. Each officina (mint workshop) was assigned part of a codeword. When all the types from a codeword series are assembled in officina order, the embedded letters spell out the "secret" codeword: AEQVITI (for Probus at Rome), AEQVIT and later EQVITI (for Probus at Ticinum), IOBI (for Diocletian at Siscia), and HPKOYΛI (for Maximian at Siscia). The following articles in NumisWiki discuss these hidden codewords:

"Coins of Probus with coded markings of AEQVITI" by Chip Scoppa

"The Translation of the Codewords AEQVITI, IOBI, and HPKOY" by Gert Boersema

"EQVITI Coins of Probus" by Doug Smith






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REFERENCES

Cohen, H. Description historique des monnaies frappes sous l'Empire Romain, Vol. 6: Macrianus to Diocletian & Maximianus. (Paris, 1886).
Colombetti, L. "Cennisulla monetazione di Probo gli antoniniani delle serie (A)EQVIT(I) (zecche de Roma e Ticinvm)." in La numismatica 20, 11 (1989), pp. 339 - 340.
Dannhuser, E. Untersuchungen zur Geschichte des Kaisers Probus (276-282). Inaugural Dissertation. (1909).
von Kolb, J. "EntrthselteSiglen auf Mnzen Diocletians and Maximians" in Numismatische Zeitschrift 4 (1872), pp. 24 - 30.
von Kolb, J. "EntrthselteSiglen auf Mnzen Diocletians and Maximians" in Numismatische Zeitschrift 5 (1873), pp. 116 - 121.
Mattingly, H., E. Sydenham & P. Webb. The Roman Imperial Coinage, Vol. V, Part II, Probus to Amandus. (London, 1933).
Missong, A, "Gleichartigsystemisirte Mnzreihen unter Kaiser Probus" in Numismatische Zeitschrift 5 (1873), pp. 102 - 115.
Mommsen, T. 'Equitius', Zeitschrift fr Numismatik, 15 (1887) pp. 251-252.
Mowat, R. "Combinaisons secrte delettres dans les marges montaires de l 'empire Romain" in Revue Numismatique 1897, pp. 67 - 81.
Pink, K. "Der Aufbau derrmischen Mnzprgung in der Kaiserzeit. VI/I, Probus" in Numismatische Zeitschrift 73 (1949), p. 13 - 74.
Robinson, A. Roman Imperial Coins in the Hunter Coin Cabinet, University of Glasgow, Vol. IV. Valerian I to Allectus. (Oxford, 1978).
Sear, D. Roman Coins and Their Values, Vol. Three, The Accession of Maximinus I to the Death of Carinus AD 235 - AD 285. (London, 2005).

Catalog current as of Thursday, December 8, 2022.
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