"Thesaurus, Thesaurium" is a word in LAW AND LEGAL

The treasury; a treasure. Thesaurus absconditus. In old English law. Treasure hidden or buried. Spelman. . Thesaurus inventus. In old English law. Treasure found; treasure trove. Bract fols. 119&, 122. Thesaurus competit domino regi, et non domino liberatis,’ nisi sit per verba specialia. Fitzh. Coron. 281. A treasure belongs to the king, and not to the lord of a liberty, unless it be through special words. Thesaurus inventus est vetus disposi tio pecuniae, etc., cujus non extat modo memoria, adeo ut jam dominum non ha beat. 3 Inst. 132. Treasure trove is an ancient hiding of money, etc., of which no recollection exists, so that it now has no owner. Thesaurus non competit regi, nisi quando nemo scit qui abscondit thesau rum. 3 Inst. 132. Treasure does not belong to the king, unless no one knows who hid it Thesaurus regis est vinculum pacis et bellorum nervus. Godb. 293. The king’s treasure is the bond of peace and the sinews of war.