Political map of Europe & the Mediterranean summer 107 (Trajan’s Iazygan War): Following his victory over Dacia (106), Trajan refused to restore territory (Oltenia) the Iazyges had lost to the Dacians a few years earlier. In response, the Iazyges declared war on the Romans but were defeated (107–108). However, after the war, the Iazyges expanded into northwest Dacia (Banat) (possibly as compensation by the Romans).