 Some documents mention a castrum, probably a supply camp, but his determination remains controversial.In the 13th century, Mugena belonged to the "Valle d'Arosio" (upper Magliasina Valley), an economic and administrative unit, which included Arosio, Breno, Cademario, Mugena, Tortoglio and Vezio.The parish church of S. Agata is first mentioned in 1361.