Archaeologists believe that Nan Madol was ruled by a powerful dynasty during its cultural and economic peak based on oral histories and the introduction of mass-produced building materials from Europe introduction of mass-produced building materials from Europe A sophisticated engineering skill and labor resources required to construct the site sophisticated engineering skill and labor resources required to construct the site B luxury burial goods and gold sarcophagi found in royal tombs luxury burial goods and gold sarcophagi found in royal tombs C presence of imagery of divine rulership appropriated from Polynesia