Lucca is a city in Tuscany, northern central Italy, situated on the river Serchio in a fertile plain near the Ligurian Sea. It is the capital city of the Province of Lucca. Lucca was founded by the Etruscans and became a Roman colony in 180 BC. The rectangular grid of its historical center preserves the Roman street plan, and the Piazza S. Michele occupies the site of the ancient forum. Lucca was the largest Italian city state with a republican constitution to remain an independent republic over the centuries - next to Venice, of course. In 1805 Lucca was taken over by Napoleon, who put his sister Elisa Bonaparte Baciocchi in charge as Princess of Lucca. After 1815 it became a Bourbon-Parma duchy, then part of Tuscany in 1847 and finally part of the Italian State.