[German version]

C. Valens H. Messius Quintus was the younger son of emperor  Decius [II 1] and Herennia Etruscilla. In September AD 250, he was named Caesar and Princeps Iuventutis (AE 1942/43, 55; ILS 518) and, after the death of his father in June 251, adopted by  Trebonianus Gallus and raised to Augustus (Zos. 1,25,1; RIC 4,3, 143ff.), probably to distract from the complicity of Trebonianus in the deaths of his father and brother. Shortly after, he died in Rome of the plague (Aur. Vict. Caes. 30,1; [Aur. Vict.] epit. Caes. 30; Eutr. 9,5)…