Fans of ancient history are laying bets on who was buried in the dark heart of a massive marble-walled tomb that is slowly coming to light in northern Greece.

Dating to the tumultuous years surrounding the death of Alexander the Great, between about 325 and 300 B.C., the tomb is the largest ever found in northern Greece—a resting place monumental enough for royalty.

The burial borders the ancient Aegean port of Amphipolis (near modern-day Amfípoli), which once served as the base for the fleet that Alexander the Great took on his invasion of Asia.

After nearly two years of digging at the site (known as the Kasta tumulus after the name of the hill it lies beneath), archaeologists are now exploring its