The city of Patras has an important history of four thousand years. Patras has been inhabited since the prehistoric age and constituted an important centre of the Mycenean era. In the antiquity it was a leading member of the Achaean League. Patras reached the peak of its power in the Roman era, when an imperial colony was founded there by Augustus. In the Byzantine period it remained a commercial city. The town experienced repeated conquests from Franks, Venice, Byzantines and finally the Ottomans. Later on, it played a leading part in the Greek revolution of 1821, the first revolt of which in Greece, broke out in Patras. In 19th century Greece, it was the second city of the country, the indisputable centre of the Peloponnese, an important export harbour and a cradle of the emerging Greek middle class. In the 20th century the city developed as a commercial and industrial hub and in spite of its overshadowing by Athens, it is now the third city of Greece and the most significant economic pole of Peloponnese and West Greece.