As the custom was prevalent of giving the command of the militia to the first officer of justice, in order to give him authority either to direct the public force against rebels or disturbers of order, or to discipline the soldier by the fear of punishment, no commander could be found who would undertake the military service of a town, without at the same time possessing the power of the judicial sword--such power as was intrusted to the podesta or captain of the people. It became necessary then to deliver into his charge what was named the signoria; and the more considerable this corps of cavalry, thus placed for a certain number of years at the service of the republic, the more this signoria, to which was attached the power of adjudging life or death in the tribunals, became dangerous to liberty. Among the first feudal lords who embraced the cause of the people and undertook the service of a town, with a body of cavalry raised among their vassals, or among the poor nobles, their adherents, was Pagan della Torre, the lord of Valsassina. He had endeared himself to the Milanese by saving their army from the pursuit of Frederick II after the battle of Cortenuova. He was attached by hereditary affection to the Guelf party; and although himself of illustrious birth, he seemed to partake the resentment of the plebeians of Milan against the nobility who oppressed them. When he died, his brother Martino, after him Raymond, then Philip, lastly, Napoleon della Torre, succeeded each other as captains of the people, commanders of a body of cavalry which they had raised and placed at the service of the city; they were the acknowledged superiors of the podesta and the tribunals. These five lords succeeded each other in less than twenty years; and even the shortness of their lives accustomed the people to regard their election as the confirmation of a dynasty become hereditary. Other Guelf cities of Lombardy were induced to choose the same captain and the same governor as Milan, because they believed him a true Guelf, and a real lover of the people.