Janus

January is named after Janus because he was the Roman god of beginnings, doorways, and transitions, making him the natural patron of the start of the new year. The month of January (Ianuarius in Latin) was added to the Roman calendar around 713 BC during the reign of Numa Pompilius, Rome's legendary second king. The name literally means 'doorway of Janus,' reflecting his role as guardian of thresholds and entrances.

No, Janus is one of the few major Roman gods with no direct Greek equivalent, making him uniquely Roman in origin and character. While most Roman deities were assimilated from Greek mythology, Janus was an indigenous Italic god whose worship was specific to Rome and its surrounding regions. Roman writers themselves noted this distinction and took pride in Janus as an authentically Roman divinity.

The Temple of Janus in the Roman Forum had a distinctive ritual function: its double doors were opened when Rome was at war and closed during times of peace. Closing the doors was a rare event that signified that the Roman state was not engaged in any military conflict anywhere in its empire. According to Roman historians, the gates were closed only a handful of times in Rome's history, most notably during the reign of Augustus in 29 BC after the Battle of Actium.

Janus is universally depicted with two faces looking in opposite directions—typically one looking toward the past and the other toward the future, symbolizing his dominion over transitions and time. Some representations show him with four faces (Janus Quadrifrons), able to see in all directions, which was associated with his role as a cosmic guardian. This imagery embodied the Roman concept of liminal moments—thresholds, crossings, and changes of state—all under Janus's divine protection.