"Patulcius" and "Clusivius" or "Clusius" are epithets related to an inherent quality and function of doors, that of standing open or shut. Janus as the Gatekeeper has jurisdiction over every kind of door and passage and the power of opening or closing them. Servius interprets Patulcius in the same way. Lydus gives an incorrect translation, "αντί του οδαιον" which however reflects one of the attributes of the god, that of being the protector of roads. Elsewhere Lydus cites the epithet θυρέος to justify the key held by Janus. The antithetical quality of the two epithets is meant to refer to the alterning opposite conditions and is commonly found in the "indigitamenta": in relation to Janus, Macrobius cites instances of Antevorta and Postvorta, the personifications of two indigitations of Carmentis.