The Twelve had split into two factions--the "Canischi" and the "Grasselli." The Canischi sided with the Tolomei, with whom were Piccolomini, Saracini, and Cerretani; the Grasselli were allied with the Salimbeni. The Emperor was expected in Tuscany, and the most honoured citizen of Siena, Giovanni di Agnolino Salimbeni, had come from Montepulciano to head the embassy that went from Siena to greet Caesar in Lombardy. Although even the magistrates in the Signoria were at daggers drawn, Giovanni's influence had delayed the catastrophe; but, on his return from the Emperor, he was killed by a fall from his horse on the way from Siena to Rocca d'Orcia. The nobles rose in mass, united with the adherents of the Nine, and _senza colpo di spada_, at the beginning of September, forced the Twelve to surrender the Palace and the entire control of the State. A new magistracy of thirteen consuls was established; one from each of the five Greater Families, five representatives of the lesser nobles, three to represent the Nine. An embassy was dispatched by this new government to the Emperor; but, in the meanwhile, the Salimbeni had made common cause with the adherents of the Twelve, and sent ambassadors on their own account. On September 24th the Salimbeni, shouting for the People and the Emperor, rushed out of their palace and gardens in arms, joined forces with the Twelve, broke open the Porta di San Prospero, and admitted Malatesta de' Malatesta, the imperial vicar, who with 800 horse had been lying in wait. From street to street the people and nobles struggled desperately with each other; during the three weeks of their rule, the latter had fortified their houses and enrolled soldiers for this emergency, which enabled them to hold their own at first even against the trained cavalry of the imperial vicar, while their overbearing and tyrannous conduct had exasperated the people to madness. A last stand was made in the Campo round the Palazzo, where there was a grim struggle, _grande e aspra battaglia_, until Malatesta carried the place by storm, and the populace, rushing in after the imperial soldiery, sacked it. The nobles fled from the city with their families, carrying with them all the goods that they could save from the wreck. Malatesta fortified himself in the Poggio Malavolti, from which, until the following January, he practically ruled the city as imperial vicar; while in the Palazzo a popular council of 124 plebeians met, which was called the _Consiglio de Riformatori_, and created a new supreme magistracy of twelve, composed of five of the _popolo minuto_, four of the Twelve, three of the order of the Nine; the Signori Dodici Difensori del Popolo Senese. The same proportion of the three _ordini_ or _Monti_ was to hold in the general council of 650 _popolani_. To reward the Salimbeni for their services to the People, or, as Malavolti, the aristocratic historian of Siena, puts it, "for the perfidy they had used against the other nobles," they were