Legio IV (or IIII) Martia was a legion of the Roman Empire, part of the Late Roman army. Its genesis is uncertain, but it probably existed in the time of Diocletian (r. 284-305), and certainly in the time of Notitia Dignitatum (390s). [1] That document places the legion at Betthorus, modern El-Lejjun in Jordan, [2] under the command of the Dux Arabiae. [3] [4] The place was in the civil jurisdiction of Palaestina Tertia.
The legion also had a fortress at Adhruh near Petra. [5] It was removed when the defence of the area was assigned to the vassal state of the Ghassanids around 530.