Rulers from this province included Claudius II, given the epithet "Gothicus," as well as the suppressor of the Palmyran rebellion, Aurelian.
One ruler born in this region won an important victory at Naissus, which gave him his moniker, while another ruler from here allegedly died campaigning against the Sassanians after being struck by lightning and was succeeded by his sons Numerian and Carinus. Another ruler from this region was proclaimed in opposition to Florian and may have been murdered by his troops out of resentment for being forced to do agricultural work. In addition to Probus and Carus, rulers from this province included a man who proclaimed himself "restorer of the world," and defeated Tetricus at the Battle of Chalons in 274. That ruler  had succeeded Quintillus and had previously won a major victory at Emesa against a rebellion raised in the name of Vaballathus. Rulers from this province included Claudius II, given the epithet "Gothicus," as well as the suppressor of the Palmyran rebellion, Aurelian. For ten points, identify this province of the Roman empire, which was the birth of many late 3rd-century soldier-emperors, including Diocletian, and which encompassed most of the modern-day Balkans.
One ruler born in this region won an important victory at Naissus, which gave him his moniker, while another ruler from here allegedly died campaigning against the Sassanians after being struck by lightning and was succeeded by his sons Numerian and Carinus.
{Illyria} or {Illyricum} [accept anything mentioning {Illyria}; prompt on "{Roman Empire}"]