The initiate into each grade appears to have been required to undertake a specific ordeal or test, involving exposure to heat, cold or threatened peril. An 'ordeal pit', dating to the early 3rd century, has been identified in the mithraeum at Carrawburgh. Accounts of the cruelty of the emperor Commodus describes his amusing himself by enacting Mithraic initiation ordeals in homicidal form. By the later 3rd century, the enacted trials appear to have been abated in rigor, as 'ordeal pits' were floored over.