Note:  Do not rely on this information. It is very old.

Treasure Trove

Treasure Trove. Any money, coin, gold, silver, plate or bullion found (trouve) hidden in the earth, the owner thereof being unknown, in general belongs to the Crown, and forms one of the precarious sources of its revenue. When, however, it is found in the sea, or upon the earth, it does not belong to the Crown, but to the finder, in case no one appears to claim it. In many cases treasure trove belongs by special grant or prescription to the Lord of the Manor within whose limits it is found.