The early Christian architecture began in Rome and Constantinople in the early 4th century AD. With Christianity becoming the official state religion under Emperor Constantine, new church buildings were needed for worship. The most common church design was the basilica, adapted from Roman civic buildings. Two prominent early basilica churches were St. John Lateran in Rome (313-320 AD) and St. Peter's in Rome (333 AD), which had a nave and aisles topped by timber roofs. Alternative centralized plans like baptisteries were also sometimes used starting in the 5th century.
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