You're a renowned medievalist. An anonymous letter was slipped under your door this morning? According to the author of the letter, a fabulous artifact of inestimable value is hidden in the oak grove of the Château d'Olivey.

You're familiar with this winery with its rich medieval history. It's undoubtedly Château Olivier in the commune of Léognan.

What could this mysterious object be? Can you find it?