The history of Greek sculpture covers a period of some eight or nine hundred years, and falls into five divisions. The first is the period of development, extending from 600 to 480 B. C. The second is the period of greatest achievement, under Phidias and his followers, in the Age of Pericles, 480-430 B. C. The third is the period of Praxiteles and Scopas, in the fourth century. The fourth is the period of decline, characterized as the Hellenistic Age, and included between the years 320 and 100 B. C. The fifth is the Graeco-Roman period, which includes the work produced to meet the demand of the Roman market for Greek sculpture, and which extends to 300 A. D."