EPII is an ancient Apostolic Anaphora attributed to St. Hippolytus of Rome, a 3rd century Priest of the Church in Rome.
The Anaphora of the Apostolic Tradition, also known as the Anaphora of Hippolytus, is an ancient Christian Anaphora (also known in the contemporary Latin Rite as a Eucharistic Prayer) which is found in chapter four of the Apostolic Tradition.
In 1906 Eduard von der Goltz was the first to suggest that the anonymous manuscript discovered in the 19th century was the Apostolic Tradition historically attributed to Hippolytus of Rome, thus dating the anaphora to the mid 3rd century AD and using it in reconstructing the early worship in Rome. This understanding was subsequently accepted by the great majority of scholars of the 20th century, including Gregory Dix, and played a crucial role in the liturgical reforms of main mainstream Christian bodies
This anaphora is minimal compared with the longer and more ornate forms of the Roman Canon, and the Anaphorae of the Divine Liturgy of St. Basil the Great, and the Liturgy of St. James the Just; it is widely believed that these ancient liturgies are themselves either derived from, or closely related to, this liturgy.