Gordian II (Latin: Marcus Antonius Gordianus Sempronianus Romanus; c. 192 – April 238) was briefly Roman emperor in AD 238 with his father Gordian I during the Year of the Six Emperors. Seeking to overthrow Maximinus Thrax, he died in battle outside Carthage. Since he died before his father, Gordian II had the shortest recorded reign of any Roman emperor, at about 22 days.
General info from Wikipedia.org