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Treasure Trove from WikiPedia:

A treasure trove may broadly be defined as an amount of gold, silver, gemstones, money, jewellery, or any valuable collection found hidden underground or in places such as cellars or attics, where the treasure seems old enough for it to be presumed that the true owner is dead and the heirs undiscoverable. However, both the legal definition of what constitutes a treasure trove and its treatment under law varies considerably from country to country, and from era to era.

The term is also often used metaphorically. Collections of articles published as a book are often titled Treasure Trove, as in A Treasure Trove of Science. This was especially fashionable for titles of children's books in the early- and mid-20th century.

Treasure trove, sometimes rendered treasure-trove, literally means "treasure that has been found". The English term treasure trove was derived from tresor trové, the Anglo-French equivalent of the Latin legal term thesaurus inventus. In 15th-century English the Anglo-French term was translated as "treasure found", but from the 16th century it began appearing in its modern form with the French word trové anglicized as trovey, trouve or trove.

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