A priceless gold wreath has been unearthed in an ancient city in northern Greece, buried with human bones in a large copper vase that workers initially took for a land mine.

The University of Thessaloniki said in a statement Friday that the "astonishing" discovery was made during its excavations this week in the ruins of ancient Aigai. The city was the first capital of ancient Macedonia, where King Philip II — father of Alexander the Great — was assassinated.

Gold wreaths are rare and were buried with ancient nobles or royalty. But the find is also highly unusual as the artifacts appear to have been removed from a grave during ancient times and, for reasons that are unclear, reburied in the city's marketplace near the theater where Philip was stabbed to death.