 The area that is now Malosco, Ronzone, Sejo and Sarnonico was approved by Charter by Cardinal Ludovico Madruzzo, Prince-Bishop of the Bishopric of Trento.In 2003, Malosco was the meeting site of an international group of scholars of children's and family services that developed a plan for comparative international research on child and family community based centers.Malosco Castle (originally dated to the 12th century) was rebuilt in 1593 by Count Gerolamo Guarienti.