Although preserved in the corpus of Augustine's correspondence, this is not exactly a letter, but a record of the proceedings of the convocation of the clergy and people of Hippo on 26 September 426, when Augustine designated the presbyter Heraclius as his successor and arranged for him to take on most administrative duties.
It can be presumed that at the time there were seven presbyters at Hippo, whose names have been given here, whereas the "clergy" refers here to lower clerics.
Augustine refers also to the recent events at Milevis, where Bishop Severus performed a similar ceremony in the presence of the clergy alone, which was deemed insufficient by some people.