(born c. 215died 275, near Byzantium) Roman emperor AD 270–75. Probably from the Balkans, he became emperor after Claudius II's death and the brief reign of Claudius's brother. He reunited the empire and restored Roman power in Europe, turning back invaders and quelling revolts, securing provinces in the east and defeating the Germans to the north, for which he took the title restitutor orbis (restorer of the world). He built a new wall around Rome and increased food distribution to the poor, but his monetary and religious reforms failed. While marching to Persia, he was slain by a group of officers who mistakenly believed they had been marked for execution.