Before that time, it appears that the celebration on December 25th was known as the Feast of the Nativity, or the Feast of the Holy Birth. Where Does the Tradition of Gift-Giving Come From?

"Also to be observed are the day of the Nativity of Our Lord Jesus Christ, the Epiphany, the Ascension of Christ, the feast of the Body and Blood of Christi, the feast of Mary the Mother of God ...