 Under the guide of the Nova and the Noveschi, Siena grew in both economic and military dominance.In the 13th century, Siena was predominantly Ghibelline, in opposition to Florence's Guelph position (this conflict formed the backdrop for some of Dante Alighieri's "Divine Comedy", completed in 1320).On 4 September 1260 the Sienese Ghibellines, supported by the forces of King Manfred of Sicily, defeated the Florentine Guelphs in the Battle of Montaperti.