Valerian (/vəˈlɪəriən/; Latin: Publius Licinius Valerianus Augustus; 193/195/200 – 260 or 264), also known as Valerian the Elder, was Roman Emperor from 253 to 260 AD. He was taken captive by Sassanian Persian king Shapur I after the Battle of Edessa, becoming the first Roman Emperor to be captured as a prisoner of war, causing instability in the Empire.

Unlike many of the ephemeral emperors and rebels who bid for Imperial Power during the Crisis of the Third Century of the Roman Empire, Valerian was of a noble and traditional senatorial family. Details of his early life are elusive, but for his marriage to Egnatia Mariniana, who gave him two sons: later emperor Publius Licinius Egnatius Gallienus and Valerianus Minor.

He was Consul for the first time either before 238 CE as a Suffectus or in 238 as an Ordinarius. In 238 he was princeps senatus, and Gordian I negotiated through him for Senatorial acknowledgement for his claim as emperor. In 251 CE, when Decius revived the censorship with legislative and executive powers so extensive that it practically embraced the civil authority of the emperor, Valerian was chosen censor by the Senate, though he declined to accept the post. During the reign of Decius he was left in charge of affairs in Rome when that prince left for his ill-fated last campaign in Illyricum. Under Trebonianus Gallus he was appointed dux of an army probably drawn from the garrisons of the German provinces which seems to have been ultimately intended for use in a war against the Persians. However, when Trebonianus Gallus had to deal with the rebellion of Aemilianus in 253 CE it was to Valerian he turned for assistance in crushing the attempted usurpation. Valerian headed south but was too late: Gallus was killed by his own troops, who joined Aemilianus before Valerian arrived. The Raetian soldiers then proclaimed Valerian emperor and continued their march towards Rome. Upon his arrival in late September, Aemilianus's legions defected, killing Aemilianus and proclaiming Valerian emperor. In Rome, the Senate quickly acknowledged Valerian, not only for fear of reprisals but also because he was one of their own.

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