sanctuarium

Etymology
Possibly, via *sanctuārius, (relating to sanctity). But the u, which is unexpected for the second declension, makes this doubtful. The 🇨🇬 noun post-dates  by several centuries.

Noun

 * 1) prince's lockbox
 * 2)  shrine, sanctuary
 * 3)  relics of a saint; a case for such relics