The Della Torre (or Torriani, Italian for "Of the Tower") were an Italian noble family who rose to prominence in Lombardy during the 12th-14th centuries, until they held the lordship of Milan before being ousted by the Visconti.
The family originally sprang from the small fortified burgh of Primaluna, in the Valsassina. The first notable member was one Martino, nicknamed Il Gigante ("The Giant"), who fought in the Holy Land during the Crusades. His son Jacopo married a Visconti, Berta, and was captain of Milan. His nephew Raimondo was bishop of Como in 1262-1273 and Patriarch of Aquileia (1273-1299), while another nephew, Salvino, was podestà of Vercelli.
Jacopo's son, Pagano (III), became capitano del popolo of Milan in 1240, holding the position until his death in 1247. His brother Martino (III) imposed his personal power over the city, beginning the Torriani lordship, which lasted some 50 years. He died in 1259 and was succeeded by another brother, Filippo. Torriani possessions included Bergamo, Lodi, Novara and Vercelli. The Torriani were staunch members of the Guelph faction in Italy.
Napoleone gained power in Milan in 1265, but was defeated by the Visconti in 1277: he died the following year, imprisoned. His brother Francesco was podestà of Brescia, Alessandria, Bergamo, Lodi and Novara, and was killed in the Battle of Desio (1277), against the Visconti. With that victory the Visconti acquired power in Milan. In 1302 they were in turn ousted. Corrado Mosca, who had already been signore between 1277 and 1281, was returned to power, which he held until 1307, when he was succeeded by his son Guido. Having tried to incite the people against the Emperor Henry VII, Guido was forced to flee, and died in 1312.