Macrinus
Reign
Despite his equestrian background, Macrinus was accepted by the Senate for two reasons: for the removal of Caracalla, and for having received the loyalty of the army. The senators were less concerned by Macrinus' Mauretanian ancestry than by his equestrian social background and scrutinized his actions as emperor. Their opinion of him was reduced by his decisions to appoint to high offices men who were of similarly undistinguished background. Macrinus, not being a senator and having become emperor through force rather than through traditional means, was looked down upon.
Reign
Macrinus had several issues that he needed to deal with at the time of his accession, which had been left behind by his predecessor. As Caracalla had a tendency towards military belligerence, rather than diplomacy, this left several conflicts for Macrinus to resolve. Additionally, Caracalla had been a profligate spender of Rome's income. Most of the money was spent on the army; he had greatly increased their pay from 2,000 sesterces to 3,000 sesterces per year. The increased expenditures forced Caracalla to strip bare whatever sources of income he had to supply the difference. This shortfall left Rome in a dire fiscal situation that Macrinus needed to address.
Macrinus
Marcus Opellius Macrinus (; c. 165 – June 218) was a Roman emperor who reigned from April 217 to June 218, jointly with his young son Diadumenianus. Born in Caesarea (now called Cherchell, in modern Algeria), in the Roman province of Mauretania Caesariensis to an equestrian family of Berber origins, he became the first emperor who did not hail from the senatorial class and also the first emperor who never visited Rome during his reign. Before becoming emperor, Macrinus served under Emperor Caracalla as a praetorian prefect and dealt with Rome's civil affairs. He later conspired against Caracalla and had him murdered in a bid to protect his own life and succeeded Caracalla as emperor.