Problems in earliest attestation 
A helmeted figure on Roman coins of 280-276 and 265-242 BCE is sometimes interpreted as Roma but the identification is contestable. Other early Roman coinage shows a warlike "Amazon" type, possibly Roma but more likely genius than dea. Ennius personified the "Roman fatherland" as Roma: for Cicero, she was the "Roman state", but neither of these are dea Roma. Though her Roman ancestry is possible - perhaps merely her name and the ideas it evoked - she emerges as a Greek deity.
Roma in the Greek world 
The earliest certain cult to dea Roma was established at Smyrna in 195 BCE, probably to mark Rome's successful alliance against Antiochus III. Mellor has proposed her cult as a form of religio-political diplomacy which adjusted traditional Graeco-Eastern monarchic honours to Republican mores: honours addressed to the divine personification of the Roman state acknowledged the authority of its offices, Republic and city as divine and eternal.
Democratic city-states such as Athens and Rhodes accepted Roma as analogous to their traditional cult personifications of Demos. In 189 BCE, Delphi and Lycia instituted festivals in her honour. Roma as "divine sponsor" of athletics and pan-Hellenic culture seems to have dovetailed neatly into a well-established and enthusiastic festival circuit, and temples to her were outnumbered by her civic statues and dedications. In 133 BCE Attalus III bequeathed the people and territories of Pergamon to Rome, as to a trusted ally and protector. The Pergamene bequest became the new Roman province of Asia, and Roma's cult spread rapidly within it.
In Hellenist religious tradition, gods were served by priests and goddesses by priestesses but Roma's priesthood was male, perhaps in acknowledgment of the virility of Rome's military power. Priesthood of the Roma cult was competed among the highest ranking local elites.
In contrast to her putative "Amazonian" Roman original, Greek coinage depicts Roma in the "dignified and rather severe style" of a Greek goddess, often wearing a mural crown, or sometimes a Phrygian helmet. She is occasionally bareheaded. In this and later periods, she was often associated with Zeus (as guardian of oaths) and Fides (the personification of mutual trust). Her Eastern cult appealed for Rome's loyalty and protection - there is no reason to suppose this as other than genuine (and diplomatically sound) respect. A panegyric to her survives, in five Sapphic stanzas attributed to Melinno of Lesbos. In Republican Rome and its Eastern colonae her cult was virtually non-existent.
Very little remains of Roma's cult temples in the Eastern Mediterranean world. Four altars survive, and one deliberately mutilated statue.
Roma in Imperial cult 
|O: draped and cuirassed bust with radiate crown||R: Roma seated left on shield, holding Victory and scepter
|silver antoninianus struck by Philip the Arab in Rome 247 AD; ref.: RIC 44b|
The murder of Julius Caesar led to his apotheosis and cult as a State divus in Rome and her Eastern colonies. Caesar's adopted heir Augustus ended Rome's civil war and became princeps ("leading man") of the Republic, and in 30/29 BCE, the koina of Asia and Bithynia requested permission to honour him as a living divus. Republican values held monarchy in contempt, and despised Hellenic honours - Caesar had fatally courted both - but an outright refusal might offend loyal provincials and allies. A cautious formula was drawn up: non-Romans could only offer him cult as divus jointly with dea Roma.
Two temples were dedicated for the purpose. Roma was thus absorbed into the earliest (Eastern) form of "Imperial cult" - or from an Eastern viewpont, cult to Augustus was grafted onto their time-honoured cult to Roma. From here on, she increasingly took the attributes of an Imperial or divine consort to the Imperial divus, but some Greek coin types show her as a seated or enthroned authority, and the Imperial divus standing upright as her supplicant or servant.
The Imperial cult arose as a pragmatic and ingenious response to an Eastern initiative. It blended and "renewed" ancient elements of traditional religions and Republican government to create a common cultural framework for the unification of Empire as a principate. In the West, this was a novelty, as the Gauls, Germans and Celts had no native precedent for ruler cult or a Roman-style administration.
The foundation of the Imperial cult centre at Lugdunum introduced Roman models for provincial and municipal assemblies and government, a Romanised lifestyle, and an opportunity for local elites to enjoy the advantages of citizenship through election to Imperial cult priesthood, with an ara (altar) was dedicated to Roma and Augustus. Thereafter, Roma is well attested by inscriptions and coinage throughout the Western provinces. Literary sources have little to say about her, but this may reflect her ubiquity rather than neglect: in the early Augustan era, she may have been honoured above her living Imperial consort.
In provincial Africa, one temple to Roma and Augustus is known at Leptis Magna and another at Mactar. On the Italian peninsula, six have been proven - Latium built two, one of them privately funded. During the reign of Tiberius, Ostia built a grand municipal temple to Roma and Augustus.
In the city of Rome itself, the earliest known state cult to dea Roma was combined with cult to Venus at the Hadrianic Temple of Venus and Roma. This was the largest temple in the city, probably dedicated to inaugurate the reformed festival of Parilia, which was known thereafter as the Romaea after the Eastern festival in Roma's honour. The temple contained the seated, Hellenised image of dea Roma - the Palladium in her right hand symbolised Rome's eternity. In Rome, this was a novel realisation. Greek interpretations of Roma as a dignified deity had transformed her from a symbol of military dominance to one of Imperial protection and gravitas.
Roma's position could be more equivocal. Following the defeat of Clodius Albinus and his allies by Septimius Severus at Lugdunum, Roma was removed from the Lugdunum cult ara to the temple, where along with the Augusti she was co-opted into a new and repressive formulation of Imperial cult. Fishwick interprets the reformed rites at Lugdunum as those offered any paterfamilias by his slaves. It is not known how long this phase lasted, but it appears to have been a unique development.
In a later, even more turbulent era, a common coin type of Probus shows him in the radiate solar crown of the Dominate: the reverse offers Rome's Temple of Venus and dea Roma. While Probus' image shows his monarchic Imperium, Roma displays his claims to restoration of Roman tradition and Imperial unity.
"As personification, as goddess or as symbol, the name Roma stretches from classical Greece to Mussolini's Fascist propaganda... Roma has been seen as a goddess, a whore, a near-saint, and as the symbol of civilization itself. She remains the oldest continuous political-religious symbol in Western civilization." Ronald Mellor, Introduction, The goddess Roma.
- Mellor, 956.
- From "Sear Roman Coins & their Values (RCV 2000 Edition) #25" at www.wildwinds.com  (accessed 22 June 2009): but see Mellor, 974-5 for a more tentative approach to early helmeted figures: other possible identities have been speculated, such as Diana or the Trojan captive Rhome, who may be a mythic-poetic personification of Gk. rhome (strength). (For Rhome, see Hard, R., Rose, H.J., The Routledge Handbook of Greek Mythology, 2003, p586: limited preview available online: .
- Mellor, 963, 1004-5.
- Tacitus, Annals, 4.56
- The Roma cult did not displace cult to individual Roman benefactors. The Hellenophile general Flamininus was given divine honours jointly with Roma for his military achievements on behalf of Greek allies: Plutarch, Flamininus, 16, gives the ending lines of what he describes as a lengthy Chalcidian hymn to Zeus, Roma and Flamininus: available online at Thayer's website  (accessed June 29, 2009)
- Mellor, 967.
- Mellor, 958-9.
- Mellor, 965-6: In the East - as later in the provincial West - Roma's priests were probably elected.
- Mellor, 960-3.
- Roman cult to Fides was instituted in the Late Republic: Cicero, De Natura Deorum, 2. 61.
- English and Greek versions in Powell, Anton, The Greek World, Routledge, 1997, p369: limited preview available - 
- Mellor, 972.
- Mellor, 960-3.
- For a summary of modern viewpoints on the religious sincerity of Ruler cult see Harland, P.A., Introduction to Imperial Cults within Local Cultural Life: Associations in Roman Asia, 2003. Originally published in "Ancient History Bulletin / Zeitschrift für Alte Geschichte" 17 (2003):85-107. Available online: 
- Mellor, 972.
- Ando, 45.
- Roma may have had joint (but unattested) cult with Augustus at the three colonial Arae Sestianae of the Iberian peninsula, probably founded shortly after 19 BCE: see Mellor, 989.
- The cult altar was inaugurated in 10 or 12 BCE: Fishwick favours 12 BCE as both practical and a particularly auspicious date for Augustus
- Fishwick sees the persistence of Roma's Hellenic seniority as dea (over the Augustan divus) in Western Imperial cult.
- Mellor, 990-993: Mellor finds Roma an essential companion to the Augustan and later Imperial divi, based on the surmise of Imperial cult as less one of obedience than a Romano-Hellenic framework for co-operation and acculturation: emperors of the principate claimed to represent and sustain the "senate and people of Rome", not to dominate them.
- Priests at the Lugdunum complex were known by the Greek title of sacerdos. Most others were flamen who - contrary to Roman tradition - served a number of deities. In general, female Imperial cult honorands (such as the living or deceased and deified Empress and state goddesses) were served by a priestess. Some were wife to the cult priest, but most may have been elected in their own right. One priestess is rather confusedly flamina sive sacerdos - Western Imperial cults show remarkably liberal interpretations of cult and priesthood: some appear to be unique. However, with only one possible exception (at Toulouse) dea Roma was served by priests, as in her Hellenic cult. See Fishwick vol 1, 1, 101 & vol 3, 1, 12-13, & Mellor, 998-1002.
- Mellor, 1002-3.
- Beard et al, vol 1, 257-9.
- Mellor, 963-4.
- Fishwick,Vol. 3, 1, 199.
- Examples of Probus' coin types are shown at Doug Smith's website
- Mellor, 952.
- Ando, Clifford, Imperial ideology and provincial loyalty in the Roman Empire, illustrated, University of California Press, 2000. ISBN 0-520-22067-6
- Beard, M., Price, S., North, J., Religions of Rome: Volume 1, a History, illustrated, Cambridge University Press, 1998. ISBN 0-521-31682-0
- Fishwick, Duncan. The imperial cult in the Latin West: studies in the ruler cult of the western provinces of the Roman Empire. Brill, 1987-2005.
- Mellor, R., "The Goddess Roma" in Haase, W., Temporini, H., (eds), Aufstieg und Niedergang der romischen Welt, de Gruyter, 1991. pp 950–1030. ISBN 3-11-010389-3