At the beginning of the 10th century, thanks to the generosity of Berengar of Friuli, elected King of Italy in 888 and Emperor in 915, other splendid artifacts entered the Treasury, starting with two important pieces of goldsmith work made between the 9th and early 10th centuries:
- A reliquary cross in gold, precious stones, and pearls, known as the Cross of the Kingdom because it was worn by the sovereigns during coronation ceremonies.
- The Reliquary of the Tooth of Saint John, with a gold front covered by an exuberant decoration of gems, pearls, and filigree arranged around an eight-pointed star, and the back engraved with a scene of the Crucifixion.
Among the gifts offered by Berengar were also some liturgical manuscripts, for whose bindings ancient ivory diptychs were used, transforming them into unique and priceless objects, worthy of an imperial legacy.
The most famous is the Diptych of Stilicho, named after the Vandal general who, appointed tutor to Emperor Honorius and elected consul in 400, is depicted alongside his wife Serena and their son Eucherius.
A more classical and sumptuous style is found in the Diptych of the Poet and the Muse, dating from the end of the 5th century.
