Themiso was a late second-century or an early third-century Montanist leader and perhaps the successor of Montanus after the death of Montanus and the woman prophets.[1][2] Apollinaris of Laodicea mentioned Themiso, saying that he wrote a letter, for which he seemed to have claimed divine inspiration and the authority of the apostles, which was directed towards the wider church, in which he presented Montanist tenets as authoritative.[3][2] The letter of Themiso along with other Montanist writings, however circulated widely within the sect and were read in services during public worship.[4]