Cniva
He successfully captured the city of Philippopolis ( Plovdiv in Bulgaria ) in 250 and killed Emperor Decius and his son Herennius Etruscus at the Battle of Abritus as he was attempting to leave the Empire in 251 . 
<triplet> successfully captured <subj> Plovdiv <obj> location <triplet> Herennius Etruscus <subj> Decius <obj> father