So Roman emperors were being born in the Western Balkans and being killed by foreigners in the Eastern Balkans (Trajan Decius, Valens, Nikephorus)? The only other two emperors killed in battle with foreigners (i.e. excluding civil conflicts) being Julian the Apostate (who died in Persia) and Constantine XI (who died during the Ottoman conquest of Constantinople).
Btw, a small correction – only Moesia Prima is “(Serbia)”, while the other half of Moesia (Moesia Secunda) is in Bulgaria (and a part of Romania). Also, considering more than half of Thrace is also in Bulgaria, Maximinus Thrax should obviously have not been excluded (unless you’re implying Bulgaria isn’t Slavic, of course, which I hope you’re not).