Deinde ubi primum diem senatus habuit, [Elagabalus] matrem suam in senatum rogari iussit. Quae cum venisset, vocata ad consulum subsellia scribendo adfuit, id est senatus consulti conficiendi testis, solusque omnium imperatorum fuit, sub quo mulier quasi clarissima loco viri senatum ingressa est.
--SHA Vita Elagabali IV.1-4
When he entered the Senate for the first time, Elagabalus ordered his mother to be brought in. When she arrived, she remained at his side on the consul's bench as a secretary--indeed, she witnessed the creation of a senatorial decree! Of all the Roman emperors, Elagabalus was the only one who allowed a woman to enter the senate as if she were a man [loco viri].