Maximinus was the first of the barracks emperors – rulers who were elevated by the troops without having any political experience, a supporting faction, distinguished ancestors, or a hereditary claim to the imperial throne. As their rule rested on military might and generalship, they operated as warlords reliant on the army to maintain power. Maximinus continued the campaigns in Germania but struggled to exert his authority over the whole empire. The Senate was displeased at having to accept a peasant as Emperor. This precipitated the chaotic Year of the Six Emperors during which all of the original claimants were killed: in 238 a revolt broke out in Africa led by Gordian I and Gordian II, which was soon supported by the Roman Senate, but this was quickly defeated with Gordian II killed and Gordian I committing suicide. The Senate, fearing Imperial wrath, raised two of their own as co-Emperors, Pupienus and Balbinus with Gordian I's grandson Gordian III as "Caesar". Maximinus marched on Rome but was assassinated by his Legio II Parthica, and subsequently Pupienus and Balbinus were murdered by the Praetorian Guard.