Lucca was founded by the Etruscans (there are traces of an earlier Ligurian settlement) and became a Roman colony in 180 BC. Lucca was the second largest Italian city-state (after Venice) with a republican constitution ("comune"). In 1805 Lucca was taken over by Napoleon, who put his sister Elisa Bonaparte Baciocchi in the place reserved for the "Queen of Etruria". The city became a part of Tuscany in 1847 and later a part of Italy. The rectangular grid of its historical centre preserves the Roman street plan, and the Piazza San Michele occupies the site of the ancient forum. Traces of the amphitheatre still may be seen in the Piazza dell'Anfiteatro. Piazza dell'Anfiteatro is a public square in the northeast quadrant of walled center of Lucca, region of Tuscany, Italy. The ring of buildings surrounding the square, follows the elliptical shape of the former second century Roman Amphitheater of Lucca. The square can be reached through four gateways located at the four vertices of the ellipse. A cross is carved into the central tile of the square with the arms pointing to the four gateways of the square. Lucca is the birthplace of composers Giacomo Puccini (La Bohème, Tosca and Madama Butterfly), Nicalao Dorati, Francesco Geminiani, Gioseffo Guami, Luigi Boccherini, and Alfredo Catalani.