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In ancient Roman religion and myth, Janus (ˈdʒeɪnəs ; Ianvs ˈi̯aːnʊs) is the god of beginnings, gates, transitions, time, duality, doorways, passages, frames, and endings. He is usually depicted as having two faces. The month of January is named for Janus (Ianuarius). According to ancient Roman farmers' almanacs, Juno was mistaken as the tutelary deity of the month of January, but Juno is the tutelary deity of the month of June. Janus presided over the beginning and ending of conflict, and hence war and peace. The gates of a building in Rome named after him (not a temple, as it is often called, but an open enclosure with gates at each end) were opened in time of war, and closed to mark the arrival of peace. As a god of transitions, he had functions pertaining to birth and to journeys and exchange, and in his association with Portunus, a similar harbor and gateway god, he was concerned with travelling, trading and shipping. Janus had no flamen or specialised priest (sacerdos) assigned to him, but the King of the Sacred Rites (rex sacrorum) himself carried out his ceremonies. Janus had a ubiquitous presence in religious ceremonies throughout the year. As such, Janus was ritually invoked at the beginning of each ceremony, regardless of the main deity honored on any particular occasion. While the ancient Greeks had no known equivalent to Janus, there is considerate overlap with Culśanś of the Etruscan pantheon. The name of the god Iānus, meaning in Latin 'arched passage, doorway', stems from Proto-Italic *iānu ('door'), ultimately from Proto-Indo-European *ieh2nu ('passage'). It is cognate with Sanskrit yāti ('to go, travel'), Lithuanian jóti ('to go, ride'), Irish áth ('ford') or Serbo-Croatian jàhati ('to ride'). Iānus would then be an action name expressing the idea of going, passing, formed on the root *yā- < *y-eð2- theme II of the root *ey- go from which eō, ειμι. Other modern scholars object to an Indo-European etymology either from Dianus or from root *yā-. From Ianus derived ianua ("door"), and hence the English word "janitor" (Latin, ianitor).

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Interpretatio graeca

Interpretatio graeca (Latin, "Greek translation") or "interpretation by means of Greek [models]" is a discourse used to interpret or attempt to understand the mythology and religion of other cultures; a comparative methodology using ancient Greek religious concepts and practices, deities, and myths, equivalencies, and shared characteristics. The phrase may describe Greek efforts to explain others' beliefs and myths, as when Herodotus describes Egyptian religion in terms of perceived Greek analogues, or when Dionysius of Halicarnassus and Plutarch document Roman cults, temples, and practices under the names of equivalent Greek deities.

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Roman mythology

Roman mythology is the body of myths of ancient Rome as represented in the literature and visual arts of the Romans. One of a wide variety of genres of Roman folklore, Roman mythology may also refer to the modern study of these representations, and to the subject matter as represented in the literature and art of other cultures in any period. Roman mythology draws from the mythology of the Italic peoples and ultimately from Proto-Indo-European mythology.