theossuary:

There’s a nice little video about this piece—showing a curator/smart person opening it up and revealing the (sadly, empty) compartments inside—on the website for the exhibit Treasures of Heaven.

The reliquary is believed to have held bits of skull and breastbone purported to belong to one of the 11,000 slaughtered maiden-followers of Saint Ursula.*

Image: Unknown female saint. Source: britishmuseum on Flickr.

Reliquary bust of an unknown female saint, probably a companion of St Ursula.
South Netherlandish, c. 1520 – 1530.
© The Metropolitan Museum of Art, New York.

*Allegedly.