 In the right transept is the entrance to the Serpero Museum which houses the treasury with the Iron Crown of Lombardy, and the Late Antique ivory Poet and Muse diptych, of about 500, as well as an internationally important collection of late antique and early medieval works of various kinds, many deposited by Theodelinda herself.These include small metal 6th century ampullae from the Holy Land which are evidence of the emerging iconography of medieval art, among them the earliest depictions of the treatments of the Crucifixion and Nativity of Jesus in art that were to become standard throughout the Middle Ages and beyond.Only Bobbio has an equivalent collection of ampullae.