<P> Early Christian art and architecture adapted Roman artistic motifs and gave new meanings to what had been pagan symbols . Among the motifs adopted were the peacock, grapevines, and the "Good Shepherd". Early Christians also developed their own iconography, for example, such symbols as the fish (ikhthus), were not borrowed from pagan iconography . </P> <P> Early Christian art is generally divided into two periods by scholars: before and after either the Edict of Milan of 313, bringing the so - called Triumph of the Church under Constantine, or the First Council of Nicea in 325 . The earlier period being called the Pre-Constantinian or Ante - Nicene Period and after being the period of the First seven Ecumenical Councils . The end of the period of Early Christian art, which is typically defined by art historians as being in the 5th--7th centuries, is thus a good deal later than the end of the period of Early Christianity as typically defined by theologians and church historians, which is more often considered to end under Constantine, around 313--325 . </P> <P> During the persecution of Christians under the Roman Empire, Christian art was necessarily and deliberately furtive and ambiguous, using imagery that was shared with pagan culture but had a special meaning for Christians . The earliest surviving Christian art comes from the late 2nd to early 4th centuries on the walls of Christian tombs in the catacombs of Rome . From literary evidence, there may well have been panel icons which, like almost all classical painting, have disappeared . Initially Jesus was represented indirectly by pictogram symbols such as the Ichthys (fish), peacock, Lamb of God, or an anchor (the Labarum or Chi - Rho was a later development). Later personified symbols were used, including Jonah, whose three days in the belly of the whale pre-figured the interval between the death and resurrection of Jesus, Daniel in the lion's den, or Orpheus' charming the animals . The image of "The Good Shepherd", a beardless youth in pastoral scenes collecting sheep, was the most common of these images, and was probably not understood as a portrait of the historical Jesus . These images bear some resemblance to depictions of kouros figures in Greco - Roman art . The "almost total absence from Christian monuments of the period of persecutions of the plain, unadorned cross" except in the disguised form of the anchor, is notable . The Cross, symbolizing Jesus' crucifixion on a cross, was not represented explicitly for several centuries, possibly because crucifixion was a punishment meted out to common criminals, but also because literary sources noted that it was a symbol recognised as specifically Christian, as the sign of the cross was made by Christians from very early on . </P> <P> The popular conception that the Christian catacombs were "secret" or had to hide their affiliation is probably wrong; catacombs were large - scale commercial enterprises, usually sited just off major roads to the city, whose existence was well known . The inexplicit symbolic nature of many early Christian visual motifs may have had a function of discretion in other contexts, but on tombs they probably reflect a lack of any other repertoire of Christian iconography . </P>

Where were the earliest examples of christian art discovered