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In page Janus:

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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.[citation needed]