Kept in the lower hall of Santa Maria in Solario, the Lipsanoteca was part of the so-called Treasury of Santa Giulia, a collection of rare liturgical objects dating back to the origins of the monastery. It is an ivory casket, rectangular in shape that was supposed to serve as a protective case for relics, as can be seen from the etymology of the name, of Greek origin, consisting of leipsanon, which means relic, and théke, or container. It was made by a workshop in northern Italy, probably Milanese, in the second half of the fourth century, under the episcopate of Sant’Ambrogio. The richness of the material, the high level of execution and the preciousness of the decoration determine the importance and rarity of this artifact.