Interesting, he is not included in the ancient Roman Canon, he is elsewhere in the Usus Antiquior where he follows "beáta et gloriósa semper Vírgine Dei genitríce María, cum beátis Apóstolis tuis Petro et Paulo, atque Andréa, et ómnibus sanctis...". Which presumably indicates a growing devotion to him developing after the formalisation of the Roman Canon, certainly by the sixth century images and the inclusion of his name is everywhere and feasts are multiplied. By the sixth century in many churches he is depicted, if not in the central apse paired with the Mother of God, then he is often in the side aisle over what some suggest is the men's side of the church.
All this suggests a strong popular devotion to him, which now has dissappeared from the Church, like the morning mist. Except on his feastdays in the Usus Recentior there is no reference to him at all outside of the Lectionary, he's been airbrushed.