Janus as gatekeeper of the gates connecting Heaven and Earth and guardian of all passages is particularly related to time and motion. He holds the first place in ritual invocations and prayers, in order to ensure the communication between the worshipper and the gods. He enjoys the privilege of receiving the first sacrifice of the new year, which is offered by the "rex" on the day of the Agonium of January as well as at the kalendae of each month: These rites show he is considered the patron of the cosmic year. Ovid in his "Fasti" has Janus say that he is the original Chaos and also the first era of the world, which got organised only afterwards. He preserves a tutelary function on this universe as the gatekeeper of Heaven. His nature, qualities and role are reflected in the myth of him being the first to reign in Latium, on the banks of the Tiber, and there receiving the god Saturn, in the age when the Earth could still bear gods. The theology of Janus is also presented in the carmen Saliare. According to Johannes Lydus the Etruscans called him Heaven. His epithets are numerous "Iunonius" is particularly relevant, as the god of the kalendae who cooperates with and is the source of the youthful vigour of Juno in the birth of the new lunar month. His other epithet "Consivius" hints to his role in the generative function.