Sinalunga is a town and comune in the province of Siena, in the Tuscany region of central Italy. Aside from scanty prehistoric findings, the oldeā¦Sinalunga is a town and comune in the province of Siena, in the Tuscany region of central Italy. Aside from scanty prehistoric findings, the oldest historical remains date from the 8th century BC, when Sinalunga was perhaps an Etruscan settlement under the control of Chiusi, with some temple at the top of the hill where Sinalunga lies.