Gordium (Gordion) was the capital of the ancient kingdom of Phrygia. Its ruins are in the immediate vicinity of Polatlı, near the Turkish capital Ankara. At this site, approximately 80–90 tumuli date back to the Phrygian, Persian and Hellenistic periods. Around 35 tumuli have been excavated so far, ranging in date from the 8th century BC to the 3rd or 2nd century BC. The biggest tumulus at the site is believed to have covered the burial of the famous Phrygian King Midas or that of his father. This mound, called Tumulus MM (for "Midas Mound"), was excavated in 1957 by a team from the University of Pennsylvania Museum, led by Rodney Young and his graduate students. Among the many fine bronze artifacts recovered from the wooden burial chamber were 170 bronze vessels, including numerous "omphalos bowls," and more than 180 bronze "Phrygian fibulae" (ancient safety pins). The wooden furniture found in the tomb is especially noteworthy, as wood seldom survives from archaeological contexts: the collection included nine tables, one of them elaborately carved and inlaid, and two ceremonial serving stands inlaid with religious symbols and geometric patterns. Important bronze and wooden artifacts were also found in other tumulus burials at the site.