On the first day of the Conference, the Donatists challenged the list of the signatures of the Catholic bishops on the document in which they had assigned their representatives. The roll call followed, in which the tribune Marcellinus, who presided, called the Catholic bishops one by one, and their Donatist counterparts were to identify them. Then the roll call proceeded in the opposite way, with the Donatist bishops identified by the Catholics.

This passage shows how Sabinus, who was a presbyter of the Donatist diocese of Milevis, probably detached to the townlet of Tucca, passed to the Catholic Church with his entire community, and was made a bishop by the Catholics.