Gordian I: Proclaimed emperor, whilst Pro-consul in Africa, during a revolt against Maximinus. Ruled jointly with his son Gordian II, and in opposition to Maximinus. Technically a usurper, but retrospectively legitimized by the accession of Gordian III. Committed suicide upon hearing of the death of Gordian II. Reign 21 days.

Gordian II: Proclaimed emperor, alongside father Gordian I, in opposition to Maximinus by act of the Senate. Killed during the Battle of Carthage, fighting a pro-Maximinus army. Reign 21 days.

Pupienus: Reign 3 months and 7 days

Balbinus: Reign 3 months and 7 days

Florian: Reign 3 months

Aemilian: Reign 2 months

Carus: Reign 10–11 months

Numerian: Reign 1 year

More Info: en.wikipedia.org