In 1391 the land of Bienno, which sided with the Ghibellines, was the site of extensive cattle raiding by the Guelph Camuni, led by Baroncino Nobili of Lozio.

The peace of Breno was signed on 31 December 1397 by the representative of the community of Bienno, Lanini Bertolino di Martino, who was a Ghibelline.

Bienno is part of the club of "The Most Beautiful Villages in Italy" creation of the Council of Tourism of the Association of Italian Municipalities (ANCI).

when she left, after a fatal hunting accident caused by her husband, Count Jean Charles Tristan de Montholon , son of Charles Tristan, marquis de Montholon, suspected to have poisoned the Emperor Napoleon, in Saint Helena, and brother of Hélène Napoleone Bonaparte de Montholon , whose father could be Napoleon and who lived 90 years,[5] with the exception of the usufruct of the lower floors, left to Liberata Fostinelli and Battista Panteghini and all their descendants ad vitam eternam, to reward them from their loyalty.

[7] All buildings, museums and churches are open to the public every year, for a week, until midnight in August, during the village festival called Mostra Mercato former flour mill and forge are returned to service.