Constantinople was the center of commerce in Europe during the Middle Ages, originally called Byzantion, featuring the exchange of goods from the West and East like silk, spices, jewelry, ivory, wheat, furs and honey. Constantinople’s architecture featured an extensive palace complex, hundreds of churches, and the Hippodrome, a huge amphitheater that could hold up to 60,000 viewers. Emperor Justinian implemented a program that constructed many new public services such as roads, bridges, walls, public baths, law court, and schools. The new construction of Constantanople by Justinian was to rebuild the city after riots in 532.