Frederick II still lived, when by a unanimous insurrection, on the 20th of October, 1250, they set themselves free. All the citizens assembled at the same moment in the square of Santa Croce; they divided themselves into fifty groups, of which each group chose a captain and thus formed companies of militia: a council of these officers was the first-born authority of this newly revived republic. The podesta by his severity and partiality had rendered himself universally detested: they deposed him, and supplied his place by another judge, under the name of captain of the people, but soon afterwards decreed that the podesta and the captain should each have an independent tribunal, in order that they should exercise upon each other a mutual control; at the same time, they determined that both should be subordinate to the supreme magistracy of the republic, which was charged with the administration, but divested of the judicial power. They decreed that this magistracy, which they called the _signoria_, should be always present, always assembled in the palace of the republic, ever ready to control the podesta or the captain, to whom they had been obliged to delegate so much power. The town was divided into six parts, each _sestier_, as it was called, named two _anziani_. These twelve magistrates ate together, slept at the public palace, and could never go out but together; their function lasted only two months. Twelve others, elected by the people, succeeded them; and the republic was so rich in good citizens, and in men worthy of its confidence, that this rapid succession of _anziani_ did not exhaust their number. The Florentine militia at the same time attacked and demolished all the towers which served as a refuge to the nobles, in order that all should henceforth be forced to submit to the common law.