as podestà of the city, in 1242 Luca Grimaldi, and in 1282 Luchetto Gattilusio. The position could be fraught with personal dangers in the violent political life of the medieval commune: in 1252 Milanese heretics assassinated the Church's Inquisitor, later known as Saint Peter Martyr, at a ford in the nearby contado; the killers bribed their way to freedom, and in the ensuing riot the podestà was very nearly lynched. In 1256 the archbishop and leading nobles were expelled from the city. In 1259 Martino della Torre was elected Capitano del Popolo by members of the guilds; he took the city by force, expelled his enemies, and ruled by dictatorial powers, paving streets, digging canals, successfully taxing the countryside. His policy, however, brought the Milanese treasury to collapse; the use of often reckless mercenary units further angered the population, granting an increasing support for the Della Torre's traditional enemies, the Visconti. It is worthy of note that the most important industries throughout the period were major armaments and wool production, a whole catalogue of activities and trades is given in Bonvesin della Riva's "de Magnalibus Urbis Mediolani".
The Biscione: the coat of arms of the House of Visconti, from the Archbishops' palace in Piazza Duomo.
On 22 July 1262 Ottone Visconti was created archbishop of Milan by Pope Urban IV, against the Della Torre candidate, Raimondo della Torre, Bishop of Como. The latter thus started to publicize allegations of the Visconti's closeness to the heretic Cathars and charged them of high treason: the Visconti, who accused the Della Torre of the same crimes, were then banned from Milan and their properties confiscated. The ensuing civil war caused more damage to Milan's population and economy, lasting for more than a decade. Ottone Visconti unsuccessfully led a group of exiles against the city in 1263, but after years of escalating violence on all sides, finally, after the victory in the
