Political Cosonno from the 10th century was part of the
Lombard Leagues, which set up
Medieval communes. By the 15th century it fell under the
Duchy of Milan, until the duchy was defeated in 1525 by the
Hapsburgs. In 1706 the
Austrians took and began to control the area as Austrian-Lombardy. This lasted until between 1797 and 1802 when it became part of the
Cisalpine Republic, a
French Empire sister republic, then until 1805
Bonaparte's Italian Republic, finally Bonaparte's
Kingdom of Italy, all three French puppet states. In 1815, Austrian rule was reinstated as the
Kingdom of Lombardy–Venetia at the
Congress of Vienna, which lasted until the
Risorgimento and the establishment of the
Kingdom of Italy in 1861. Consonno was historically in the parish of Garlate (Pieve di Garlate) in the municipality of Monte di Brianza. The name Cosonno was attested in a document of 1085, describing an Albenga, daughter to Alberto "de loco Cussonno' (man from Cusonno), who was married to Andrea Giovanni, who owned vineyards in Vimaggiore, then under the jurisdiction of the parish of Decimo. In 1162 Consonno was a possession of the
Benedictine monastery in the municipality of
Civate, north-west from Cosonno on Lake Annone, which, under the authority of
Frederick I, had an autonomy which included statutory rights over roads and watercourses within countryside near Milan, and a church at Consonno (or Sansono). By 1412, Consonno was itself a municipality, but still in the ecclesiastical parish of Garlate, which through legal representation took an oath of loyalty to
Filippo Maria Visconti, 3rd duke of Milan, by which there was to be no interference or outside jurisdiction over the property of the abbey and its inhabitants. Garlate was the ecclesiastical capital of the
Archdiocese of Milan, and also a civil district. The duke had acknowledged earlier tax exemptions to the "Martesana Superiore" (an area covered by today's Brianza), made in 1373 by
Bernabò Visconti (
Lord of Milan), and in 1385 by
Gian Galeazzo Visconti, 1st duke of Milan to the places and settlements of Brianza. Consonno in 1572 was part of those lands in the Duchy of Milan which fell under the salt tax. ==City of Toys==