Procession

A procession (French procession via Middle English, derived from Latin, processio, from procedere, to go forth, advance, proceed) is an organized body of people walking in a formal or ceremonial manner.

Processions have in all peoples and at all times been a natural form of public celebration, as forming an orderly and impressive ceremony. Religious and triumphal processions are abundantly illustrated by ancient monuments, e.g. the religious processions of Egypt, those illustrated by the rock-carvings of Boghaz-Keui, the many representations of processions in Greek art, culminating in the great Panathenaic procession of the Parthenon Frieze, and Roman triumphal reliefs, such as those of the arch of Titus.

Processions played a prominent part in the great festivals of Greece, where they were always religious in character. The games were either opened or accompanied by more or less elaborate processions and sacrifices, while processions from the earliest times formed part of the worship of the old nature gods, as those connected with the cult of Dionysus and the Phallic processions, and later formed an essential part of the celebration of the great religious festivals (e.g. the processions of the Thesmophoria, and that of the Great Dionysia), and of the mysteries (e.g. the great procession from Athens to Eleusis, in connection with the Eleusinia).

Of the Roman processions, the most prominent was that of the Triumph, which had its origin in the return of the victorious army headed by the general, who proceeded in great pomp from the Campus to the Capitol to offer sacrifice, accompanied by the army, captives, spoils, the chief magistrate, priests bearing the images of the gods, amidst strewing of flowers, burning of incense and the like (Ovid, Trist. iv. 2, 3 and 6). Connected with the triumph was the pompa circensis, or solemn procession that preceded the games in the circus. It first came into use at the Ludi Romani, when the games were preceded by a great procession from the Capitol to the Circus. The praetor or consul who appeared in the ponipa circensis wore the robes of a triumphing general (see Mommsen, Staatsrec/zt I. 397 for the connection of the triumph with the ludi). Thus, when it became customary for the consul to celebrate games at the opening of the consular year, he came, under the empire, to appear in triumphal robes in the processus consularis, or procession of the consul to the Capitol to sacrifice to Jupiter.

...
Wikipedia