This day is sacred to Ops Consivia, or the earth-goddess, is associated with the god Consus, but is considered to be the wife of Saturn. The shrine to Ops Consivia was located in the Regia and on this day the Vestal Virgins would have opened the room of sacred objects and performed rites unknown. The purpose of the rites was to ensure the fertility of the earth.
     The Council of Nicea, in Greece, first Ecumenical Council of the Catholic Church, concludes on this day in 325 (MLXXVIII A.V.C.) . It had repudiated the doctrines of Arius and adopted the following Creed:

We believe in one God the Father Almighty, Maker of all things visible and invisible; and in one Lord Jesus Christ, the only begotten of the Father, that is, of the substance [ek tes ousias] of the Father, God of God, light of light, true God of true God, begotten not made, of the same substance with the Father [homoousion to patri], through whom all things were made both in heaven and on earth; who for us men and our salvation descended, was incarnate, and was made man, suffered and rose again the third day, ascended into heaven and cometh to judge the living and the dead. And in the Holy Ghost. Those who say: There was a time when He was not, and He was not before He was begotten; and that He was made our of nothing (ex ouk onton); or who maintain that He is of another hypostasis or another substance [than the Father], or that the Son of God is created, or mutable, or subject to change, [them] the Catholic Church anathematizes.

     The council also dealt with the controversy as to the time of celebrating Easter and the Meletian schism.