A mountain-top throne of the gods
On a 2,134-meter (7,001-foot) peak in the Taurus Mountains, King Antiochus I of Commagene constructed his own tomb-sanctuary, or hierothesion, around 62 BCE. The monument's central feature is a 49-meter-high tumulus, a conical mound of crushed rock with a diameter of 152 meters, which is believed to cover the king's burial chamber. To date, excavations and geophysical surveys have not located the tomb itself within the mound.
The tumulus is flanked by three terraces—East, West, and North—which were ceremonial spaces. The East and West terraces feature colossal seated limestone statues, originally 8 to 9 meters (26–30 ft) tall. Earthquakes or iconoclasm have since toppled their heads, which now rest on the ground before the thrones. The figures represent a syncretic pantheon created by Antiochus to merge Persian and Greek beliefs. The lineup includes Antiochus I himself, the fertility goddess Commagene (Tyche), Zeus-Oromasdes (a combination of the Greek and Persian sky gods), Apollo-Mithras-Helios-Hermes, and Heracles-Artagnes-Ares. Guardian statues of a lion and an eagle stand at each end of the rows of deities.
The lion horoscope
The site's most direct link to a specific date is a stone slab known as the Lion Horoscope, found on the western terrace. The relief, measuring 1.75 by 2.40 meters, shows a lion whose body is marked with nineteen eight-pointed stars that map the constellation of Leo. A crescent moon, representing a new moon, sits on the lion's chest.
Above the lion's back are three larger, sixteen-pointed stars with Greek labels identifying them as the planets Mars, Mercury, and Jupiter. Astronomers have calculated that this specific celestial arrangement—a planetary conjunction within the constellation Leo—occurred on July 7, 62 BCE. This date may mark the day Antiochus I was installed on the throne by the Roman general Pompey, or another foundational event for his kingdom. The entire complex is aligned with the sun's movements, is a massive open-air calendar that connects the king's reign and final resting place to the cosmos. The site remained largely unknown to the wider world until its rediscovery in 1881 by German engineer Karl Sester.