All the porphyry columns in Rome, the red porphyry togas on busts of emperors, the porphyry panels in the revetment of the Pantheon, as well as the altars and vases and fountain basins reused in the Renaissance and dispersed as far as Kiev, all came from the one quarry at "Mons Porpyritis" ("Porphyry Mountain", the Arabic "Jabal Abu Dukhan"), which seems to have been worked intermittently between 29 and 335 AD. Porphyry was also used for the blocks of the Column of Constantine in Istanbul.