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In page Severan dynasty:

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Macrinus was the first Roman emperor who did not come from a senatorial family[1]: 1039 . He was born in 164 at Caesarea in Mauretania, now Cherchell, Algeria[citation needed]. Though not related to Severans while also being of just equestrian rank and having been born into a Moorish family[2]: 20 [1]: 1039 , he rose through the ranks all the way to being a praetorian prefect under Caracalla[1]: 1039 . In 217 Macrinus became involved in a successful conspiracy to kill Caracalla[1]: 1039 , and soon after the murder trooops saluted Macrinus as augustus[3]: 10 [1]: 1039 .