1. Scriptural / Textual
- No central canon equivalent to Bible or Vedas. Roman religion was pragmatic, ritual-based, not doctrinal.
- Surviving texts: hymns (Carmen Arvale, Carmen Saliare), prayers in Livy, Varro’s Antiquitates rerum divinarum (fragmentary), Ovid’s Fasti, Cicero’s De Natura Deorum.
- Philosophical writings (Stoic, Epicurean, Neoplatonist) shaped elite interpretation.
- Problems: ritual formulae often fragmentary, many texts mediated by hostile or Christian authors, canonization never systematized.
2. Oral Traditions
- Priestly chants, litanies, calendars recited in ceremonies (e.g., Arval Brothers’ hymn).
- Myths of foundation (Romulus, Aeneas) circulated orally before literary codification by poets like Virgil and Livy.
- Fragile: regional variation, political reshaping under emperors, later Christian suppression.
3. Archaeological / Material
- Vast evidence: temples (Pantheon, Capitoline), altars, household shrines (lararia), votive offerings, ritual implements.
- Inscriptions and coinage document cults, priesthoods, and imperial divinization.
- Limitations: durable stone overrepresents elite/state cults; private, rural religion underrepresented.
4. Epigraphic / Inscriptions
- Dedicatory inscriptions to gods, honorific statues, funerary epitaphs, imperial edicts.
- Reveal patronage networks, family piety, spread of cults (e.g., Isis, Mithras).
- Often formulaic; more about civic display than lived practice.
5. Historical Records
- Roman historians (Livy, Tacitus, Suetonius, Plutarch, Cassius Dio) preserve accounts of omens, prodigies, festivals, reforms (e.g., Augustus’ religious restorations).
- Administrative calendars (Fasti) map ritual cycles.
- Issues: political spin, retrospective rationalization, outsider distortion in later Christian sources.
6. Comparative / Cross-Cultural Parallels
- Shared Indo-European ritual structures with Greeks, Etruscans, and others.
- Adapted foreign deities: Greek (Apollo, Hercules), Anatolian (Cybele), Egyptian (Isis).
- Useful for diffusion studies, but risk of overstating continuity (Roman religion was highly syncretic).
7. Modern Ethnography
- Limited direct ethnography (tradition extinct).
- Archaeological-contextual ethnography: reconstruction of ritual from lararia in Pompeii, or mithraea across empire.
- Risk: projecting modern categories (e.g., “religion” vs “superstition”) onto Roman practice.
8. Critical Evaluation
- Highest authenticity: inscriptions, archaeological sites (direct, datable, less interpretive drift).
- Moderate: literary sources (elite, often with philosophical/political overlay).
- Weakest: oral remnants (reconstructed through texts).
- Must balance etic (outsider: Christian, modern historians) and emic (inscriptions, ritual formulae).
- Roman religion appears less as a doctrinal system, more as a lived network of cultic obligations, civic rituals, and household piety.