republic, struggling internally between nobles and the popular party, usually worked in political opposition to its great rival, Florence, and was in the 13th century predominantly Ghibelline in opposition to Florence's Guelph position (this conflict formed the backdrop for some of Dante's Commedia).
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. Before the battle, the Sienese army of around 20,000 faced a much larger Florentine army of around 33,000. Prior to the battle, the entire city was dedicated to the Virgin Mary (this was done several times in the city's history, most recently in 1944 to guard the city from Allied bombs). The man given command of Siena for the duration of the war, Bonaguida Lucari, walked barefoot and bareheaded, a halter around his neck, to the Duomo. Leading a procession composed of all the city's residents, he was met by all the clergy. Lucari and the bishop embraced to show the unity of church and state, then Lucari formally gave the city and contrade to the Virgin. Legend has it that a thick white cloud descended on the battlefield, giving the Sienese cover and aiding their attack. The reality was that the Florentine army launched several fruitless attacks against the Sienese army during the day, then when the Sienese army countered with their own offensive, traitors within the Florentine army killed the standard bearer and in the resulting chaos, the Florentine army broke up and fled the battlefield. Almost half the Florentine army (some 15,000 men) were killed as a result. So crushing was the defeat that even today if the two cities meet in any sporting event, the Sienese supporters are likely to exhort their Florentine counterparts to “Remember Montaperti!”.
The limits on the Roman town, were the earliest known walls to the city. During the 10th and 11th centuries, the town grew to the east and later to the
