Sec. 54.--_How the Florentines marched upon Pistoia and took it, and then upon Siena and took many of their fortresses._ Sec. 55.--_How the Florentines marched against Siena, and the Sienese came to terms with them, and there was peace between them._ [Sidenote: 1254 A.D.] [Sidenote: Cf. Inf. xxxi. 40, 41.] The next year, 1254, Messer Guiscardo da Pietrasanta, of Milan, being Podesta of Florence, the Florentines marched against the city of Siena and encamped against the castle of Montereggioni and laid siege to it, and of a surety they would have taken it, for the German garrison was in treaty to surrender it for 50,000 lire of 20 soldi to the gold florin; and in one single night the Ancients found twenty citizens each of whom offered a thousand of them, without counting smaller sums, so well disposed for the good of the commonwealth were the citizens of those days. But the Sienese, for fear of losing Montereggioni, agreed to the terms of the Florentines, and peace was made between them and the Sienese, and they completely surrendered the castle of Montalcino to the Florentines. [Sidenote: 1254 A.D.] [Sidenote: 1260 A.D.] [Sidenote: 1256 A.D.] Sec. 56.--_How the Florentines seized the fortress of Poggibonizzi and that of Mortennana._ Sec. 57.--_How the Florentines routed them of Volterra and took their city in the fight._ Sec. 58.--_How the Florentines marched against Pisa, and the Pisans submitted to their terms._ Sec. 59.--_How the great Khan of the Tartars became a Christian, and sent his army, under his own brother, against the Saracens of Syria._ Sec. 60.--_How the first war arose between the Genoese and the Venetians._ Sec. 61.--_How the Count Guido Guerra expelled the Ghibelline party from Arezzo, and how the Florentines reinstated it._ Sec. 62.--_How the Pisans broke the peace, and how the Florentines routed them at the bridge over the Serchio._ Sec. 63.--_How the Florentines destroyed the castle of Poggibonizzi the first time._ Sec. 64.--_Incident telling of a great miracle concerning the body of Christ which came to pass in the city of Paris._ Sec. 65.--_How the Popolo of Florence drave out the Ghibellines for the first time from Florence, and the reason why._ [Sidenote: 1258 A.D.] [Sidenote: Par. xvi.] [Sidenote: Inf. xxxii. 118, 119.]