A titulus was a church within the walls of the late antique city of Rome where one or more priests (presbyters; Priest/Presbyter) of the Roman church were stationed. By 595 CE, there were at least 24 churches of this type (Greg. M. Ep. 5.57a; MGH.Ep. 1.366–367). Tituli were described in late antiquity as a uniquely Roman institution (e.g. Cabié, 1973) and may not have existed elsewhere.