Shapur
I or Sapor I, d.272, king of Persia (24172), son and successor of Ardashir I, of the
Sassanid or Sassanian dynasty. He was an able warrior king. Although
he was defeated by the Roman emperor, Gordian III, in 242, Gordian's
successor, Philip (Philip the Arabian), concluded a peace with him guaranteeing Shapur's power
in Armenia and Mesopotamia. In 260 he achieved his greatest triumph
by defeating the Roman emperor Valerian at Edessaa landmark in the decline of Rome. The rise of Odenathus of Palmyra cut into Shapur's territories and even threatened Ctesiphon. Yet
Shapur not only maintained Persian power in the west but also rebuilt
Persian economy. He promoted a program of public works, and in later
years he commissioned the translation of numerous Greek and Indian writings.
He placed Mani, the founder of Manichaeism, under his protection.