Procession, in Christianity, organized body of people advancing in formal or ceremonial manner as an element of Christian ritual or as a less official expression of popular piety. Public processions seem to have come into vogue soon after the recognition of Christianity as the religion of the Roman Empire by Constantine in the 4th century.
Of the vast number of processions that developed during the Middle Ages, some of the more important still have a place in the ritual of the Roman Catholic Church. They include ordinary processions, held on certain yearly festivals throughout the universal church and on other days according to the customs of the local churches, and extraordinary processions, held for special occasions (e.g., to pray for rain or good weather, in time of storm, famine, plague, war, and other disasters). Other processions characteristic of certain localities, though not regulated so strictly by the church and considered non-liturgical, play an important part in the religious life of the people; in the United States, for example, May processions are sometimes conducted in honor of the Virgin Mary.
This was a rosary procession on the Virginia Beach Boardwalk organized by St. Benedict's Parish (Chesapeake, VA).