In the more than two years since University of Cincinnati researchers unearthed the 3,500-year-old tomb of a Bronze Age warrior in southwest Greece, an incredible trove of riches has emerged, including four gold signet rings that have challenged accepted wisdom among archaeologists about the origins of Greek civilization.

But that wasn’t the only secret hidden there beneath the hard-baked clay. It would take another year before the so-called “Griffin Warrior” revealed his most stunning historical offering yet: an intricately carved gem, or sealstone, that UC researchers say is one of the finest works of prehistoric Greek art ever discovered.

The “Pylos Combat Agate,” as the seal has come to be known for the fierce hand-to-hand battle it portrays, promises not only to rewrite the history of ancient Greek art, but to help shed light on myth and legend in an era of Western civilization still steeped in mystery.

The seal is the latest and most significant treasure to emerge from the treasure-laden tomb of the Griffin Warrior, which was hailed as the most spectacular archaeological discovery in Greece in more than half a century when it was uncovered in an olive grove near the ancient city of Pylos in 2015.

The remarkably undisturbed and intact grave revealed not only the well-preserved remains of what is believed to have been a powerful Mycenaean warrior or priest buried around 1500 B.C., but also an incredible trove of burial riches that serve as a time capsule into the origins of Greek civilization.