Insecure rulers of an uncertain world. The tetrarchs (from the Greek words for "Four rulers") were the four co-rulers that governed the Roman Empire as long as Diocletian's reform lasted. The embracing figures are not portraiture but rather generic representations of one of the Augusti and one of the Caesars. The porphyry sculpture dates from the 4th century and has an interesting history, having been produced in Asia Minor but standing today on a corner of Saint Mark's in Venice. Image from Wikimedia Commons
; Nino Barbieri
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