vives from dates near the origins of Christianity. The oldest surviving Christian paintings are from the site at Megiddo, dated to around the year 70, and the oldest Christian sculptures are from sarcophagi, dating to the beginning of the 2nd century. Until the adoption of Christianity by Constantine Christian art derived its style and much of its iconography from popular Roman art, but from this point grand Christian buildings built under imperial patronage brought a need for Christian versions of Roman elite and official art, of which mosaics in churches in Rome are the most prominent surviving examples. Christian art would soon become the foundation of churches across Europe. Stained glass windows often depict biblical scenes to be reflected across the inner workings of the building. Murals and altarpiece art also fill churches with intricate and expressive Christian images. During the development of early Christian art in the Byzantine Empire (see Byzantine art), a more abstract aesthetic replaced the naturalism previously established in Hellenistic art. This new style was hieratic, meaning its primary purpose was to convey religious meaning rather than accurately render objects and people. Realistic perspective, proportions, light and colour were ignored in favour of geometric simplification of forms, reverse perspective and standardized conventions to portray individuals and events. The controversy over the use of graven images, the interpretation of the Second Commandment, and the crisis of Byzantine Iconoclasm led to a standardization of religious imagery within the Eastern Ortho