an ancient principality in Italy, now one of the provinces of the grand duchy of Tuscany. It is 136 square miles in extent, and contains one city and eleven villages, with 13,900 inhabitants. The princely house, though mediatized, continues to hold the proprietorship, as before 1815. It is a marshy and very unhealthy tract of country. The capital is the city of the same name, situated on the Bay of Follonica. It is slightly fortified towards the sea only, and contains 1200 inhabitants, mostly occupied in the fisheries. Long. 10. 25. 42. E. Lat. 42. 55. 27. N.