 The new Spanish King Philip II of Spain, owing huge sums to the House of Medici, ceded Siena's entire territory to the Duke of Florence (apart from a series of coastal fortress annexed to the State of the "Presidi"), to which it belonged for the next three centuries until the Italian unification in the 19th century.An exiled Sienese republican government of 700 Sienese families in Montalcino did not concede defeat in the Battle of Marciano and continued to resist Tuscan rule until 1559.Siena possessed most of the modern day provinces of Grosseto and Siena in the region of Tuscany in central Italy, including a coastline on the Tyrrhenian Sea.