Pertinax - Augustus of Imperium Romanum from 1 January 193 to 28 March 193
Publius Helvius Pertinax Augustus was Roman Emperor for the first three months of 193.

As the successor to the assassinated Commodus, he was the first to serve as emperor during the tumultuous Year of the Five Emperors.

He attempted to institute several reform measures, and one of those reforms - the restoration of discipline among the Praetorian Guards - led to conflict that eventually culminated in Pertinax's murder by the Guard.

Following the murder, the Guard auctioned off the imperial throne to the highest bidder - the wealthy senator Didius Julianus. This led to a civil war, in which the general Septimius Severus was ultimately successful.
Pertinax
Emperor Pertinax of the Roman Empire

(1) Pertinax 193 AD
Obverse: IMP CAES P HELV PERTIN AVG, Head of Pertinax facing right, wearing laurel wreath
Reverse: AEQVIT AVG TR P COS II, Aequitas standing facing left, holding scales and cornucopia
Ref: RIC IV Pertinax 1a