Marinianus was Roman consul in the year 268, under Emperor Gallienus. [1] He was related to the Egnatia gens and has been speculated to be the cousin, son or nephew of Emperor Gallienus. [2] Marinianus and Valerianus Minor (Gallienus' brother), were killed during the autumn of 268 in a purge of Gallienus' partisans. [3]