Jovian ; 331 – 17 February 364) was Roman emperor from June 363 to February 364. As part of the imperial bodyguard, he accompanied Julian on his Persian expedition. Julian was killed in battle, and the exhausted and ill-provisioned Roman army declared Jovian his successor. Unable to cross the Tigris, Jovian made peace with the Sasanian Empire on humiliating terms. He spent the rest of his seven-month reign traveling back towards Constantinople, but died at Dadastana without reaching the capital city.