This document provides an overview of early Christian and Byzantine art from the 3rd century to the 15th century. It begins with a brief history of the division of the Roman Empire into western and eastern halves in the 4th century. Early Christian art developed in the catacombs and other hidden places out of necessity during periods of persecution. Notable examples include frescoes and mosaics incorporating Christian symbolism. The Edict of Milan in 313 marked the beginning of the Period of Recognition, during which large churches like St. Peter's Basilica in Rome were constructed. Byzantine art flourished in the Eastern Roman Empire centered in Constantinople from the 4th to 14th centuries, characterized by stylized realism