Roman Emperor from late 316 to March 1 , 317 . Valens had previously been dux limitis [ 1 ] (duke of the frontier) in Dacia , but this is all we know of him. Photo at: http://www.livius.org/a/1/legio/viii_augusta/viii_augusta_mus_corinth1.JPG Tombstone of Gaius Valerius Valens, Corinth. In the first civil war between Licinius