 Complete the following phrase:  During the 10th and 11th centuries Amalfi was estimated to have a population of 50,00070,000 people. It rose to become an economic powerhouse, a commercial center whose merchants dominated Mediterranean and Italian trade in IX and X century, before being surpassed and superseded by the other maritime republics of the North, like Pisa, Venice, and Genoa. In 1073, Amalfi lost its independence, falling to 