Construction workers digging about four miles north of Aarhus, Denmark have accidentally discovered a “spectacular” Viking gravesite. Dating back to the second half of the 10th century, the archeological trove may even tie directly to one of Denmark’s most famous rulers: King Harald “Bluetooth” Gormsson. The roughly 30 graves containing artifacts and treasures represent the era’s entire social hierarchy spectrum, according to an announcement by the Moesgaard Museum. Conservators work to lift a Viking Age coffin from the archeological site. That find, discovered in the 1980s, may have belonged to an earl or steward of King Harald Bluetooth—a legendary figure in his own right.