foreign invasions (notably that of Emperor Henry VII in 1311), the Cavalcabò lasted until 29 November 1322, when a more powerful family, the Visconti of Galeazzo I, came to prominence that in Cremona was to last for a century and a half. The Visconti's signoria (lordship) was interrupted in 1327 by Ludwig the Bavarian, in 1331 by John of Bohemia, and in 1403 by a short-lived return of the Cavalcabò. On 25 July 1406, captain Cabrino Fondulo killed his employer Ubaldo Cavalcabò along with all the male members of his family, and assumed control over Cremona. However, he was unable to face the task, and ceded the city back to the Visconti for a payment of 40,000 golden florins. Thus Filippo Maria Visconti made his signoria hereditary. Cremona became part of the Duchy of Milan, following its fate until the unification of Italy. Under the Visconti and later the Sforza, Cremona underwent high cultural and religious development. In 1411 Palazzo Cittanova become the seat of the university of fustian merchants. In 1441 the city hosted the marriage of Francesco I Sforza and Bianca Maria Visconti in the temple built by the Benedictines, which today is the church of Saint Sigismund. For that occasion a new sweet was devised, which evolved into the famous torrone. Ludovico il Moro assisted in the financing of several building projects for the cathedral, the church of St. Agatha and the Communal Palace. In 1446, Cremona was encircled by the condottieri troops of Francesco Piccinino and Luigi dal Verme. The siege was raised after the arrival of Scaramuccia da Forlì from Venice. Foreign occupations Republic of Venice From 1499 to 1509 Cremona was under Venetian control. The victory of the Italian League at Agnadello gave it back to the Duchy of Milan. Spain However, Cremona was assigned to Spain under the Treaty of Noyon (1513). Cremona fell to the new rulers only in 1524 when the Castle of Santa Croce surrendered. The French were finally expelled from the duchy two years later, with the Treaty of Madrid, and subsequently Cremona remained a Spanish dominion for many years. During that time several building improvements or additions were made, including the Loggia of the cathedral's Porch by Lorenzo Trotti (1550) and the new church of San Siro and Sepolcro by Antonio Gialdini (1614). During Spanish rule, Cremona saw the famine of 1628 and the plague of 1630. Austria