The Christian movement known as the Penitents goes back to the 4th century. Those who had committed serious sins confessed their sins to the Bishop or his representative and were assigned a penance that was to be carried out over a period of time. After completing their penance, they were reconciled by the Bishop with a prayer of absolution offered in the midst of the community. Penance assumed many forms, such as pilgrimages to holy sites; constructing, repairing and rebuilding churches; and caring for the poor and sick.
During the time they worked out their penances, the penitents often had special places in church and wore special garments to indicate their status. Like the catechumens who were preparing for baptism, they were often dismissed from the Sunday assembly after the Liturgy of the Word. The use of ashes at the beginning of Lent is an extension of the use of ashes with those entering the Order of Penitents.