Buried For 1600 Years. Workman Thought It Was A "Stone". -- Mr. F.W. Grimes (right) showing the head of Mithras to a colleague on the site. Digging on the site of an ancient Roman Temple near the Mansion House yesterday workman Sam Thomas dug up what he thought was just a stone. An archaeologist thought otherwise and the stone was identified as the marble head of the pagan god Mithras. The head, delicately carved, bears a phrygian cap, symbol of the Mithraic cult, and was found buried at the bas