The Perpetual Peace (ἀπέραντος εἰρήνη[1]), signed in 532 between the East Roman (Byzantine) Empire and Sassanid Persia, was a peace treaty of indefinite duration, which concluded the Iberian War (527–531) between the two powers. It heralded a period of relatively cordial relations, but lasted only until 540, when hostilities resumed over the control of Lazica.