De sacramentis ("On the sacraments") is a short liturgical treatise consisting of six homilies ("books") addressed to the newly baptized and it treats baptism, anointment with chrism, and Eucharist. Its attribution to Ambrose was doubted in the modern times - first by the followers of Ulrich Zwingli in the 16th c. who discussed its authenticity on the Marburg Colloquy in 1529 (the debate between Martin Luther and Ulrich Zwingli over the Real Presence of Christ in Eucharist). The Ambrosian authorship was later challenged by the Benedictine editors of Ambrose in the 17th c. and subsequent scholars accepted its spurious character. T. Scherman (1903) proposed the authorship of Maximus of Turin. Morin (1897) made an attempt to attribute De sacramentis to Nicetas of Remesiana, the concept later accepted by Gamber (1967) but the view was not universally accepted. Morin himself later changed his mind and opted for the Ambrosian authorship (1928). Conolly (1942) noticed that the quotations of the Bible in De sacramentis are very similar to the specific Biblical text used by Ambrose in his other writings. The authenticity of De sacramentis is accepted by Faller (1955: *19-*30), Botte (1961: 12-21). For further reading see references in Di Berardino 1986: 172-173.