With the victory of the Roman emperor Constantine at the Battle of Milvian Bridge in 312 AD, Christianity became a lawful and then the privileged religion of the Roman Empire. The faith, already spread around the Mediterranean, now expressed itself in buildings. Christian architecture was made to correspond to civic and imperial forms, and so the Basilica, a large rectangular meeting hall became general in east and west, as the model for churches, with a nave and aisles and sometimes galleries and clerestories. While civic basilicas had apses at either end, the Christian basilica usually had a single apse where the bishop and presbyters sat in a dais behind the altar. While pagan basilicas had as their focus a statue of the emperor, Christian basilicas focused on the Eucharist as the symbol of the eternal, loving and forgiving God.
