The emperor’s arrival at Viterbo was immediately felt in Rome, where a contest had previously arisen between Stefano Colonna seconded by Napoleone Orsini, who adhered to King Robert; and his own brother Sciarra Colonna, Jacobo Savelli, and Tebaldo di Santa Stazio, captains of the people; the first two had been expelled; for Castruccio’s arts and Ghibelline ducats had been long at work in that factious city which the pontiff’s absence at Avignon left in a state of continual agitation. It was generally governed by an oligarchy headed by the pope’s ministers and those of the king of Naples; by the Colonnas, Savelli, and Orsini; with occasional bursts of the most furious democracy; the senator administered justice; a council of fifty-two members nominally formed the government and was presided over by the prefect of Rome, two or three captains of the people along with the senator being elected by the popular voice. The Ghibelline chiefs sent privately to Ludwig, desiring that no heed should be given to the Roman ambassadors, who wished to settle the terms on which he was to be received, but that he should march directly to Rome; with this hint Castruccio, who was appointed to answer the embassy, immediately ordered the trumpets to sound to horse, saying courteously,“This is the emperor’s answer.” These messengers were detained, and Ludwig, suddenly appearing before the city, surprised the disaffected, confirmed the doubtful, and gave spirit to his adherents. He was crowned on the 16th of January, 1328. During these transactions Benedetto da Orvieto, the duke of Calabria’s judicial vicar, arrived at Florence, where the citizens still found resources to complete the walls south of the Arno and erect the present Roman gate so as to secure that quarter of the town, which had been endangered by Castruccio’s late inroads on the Val di Greve. Neither was the duke’s lieutenant Philip Sanguineto inclined to sleep; by means of two Guelfic citizens of Pistoia, friends of Simone della Tosa, well acquainted with the weak points of that city, a plan was laid to surprise it and successfully executed. Having accurate measures of the walls and ditches, Sanguineto, with six hundred men-at-arms, the two Pistoians, and Simone della Tosa, but no other Florentine, repaired by night to Prato; he was there joined by two thousand infantry with the requisite besieging engines, ladders, and bridges, and continuing his march arrived under the weakest point of the Pistoian capital before daylight. The ditch was frozen hard enough to allow one man in armour to pass at a time, and thus a hundred men-at-arms gained the ramparts, unperceived until the officer of the night visited the guards with his patrol; a short conflict then took place, the officer and patrol were put to death; but an alarm was given, the garrison was immediately under arms, and the whole city in confusion.