Treasure-trove
Treasure-trove , noun
[Treasure + Old French trové, French trouvé, past participle of Old French trover to find, French trouver. See Trover.]
(Common Law) Any money, bullion, or the like, found in the earth, or otherwise hidden, the owner of which is not known. In England such treasure belongs to the crown; whereas similar treasure found in the sea, or upon the surface of the land, belongs to the finder if no owner appears.