Legio IIII Martia
This legion is mentioned in the text known as Notitia Dignitatum, a catalogue of officials and Roman army units, as they existed in the late fourth century. It states that the Fourth Martian legion was one of the units commanded by the general responsible for the province Arabia. It was based in Betthorus, modern Lejjun (Jordan).
The legion was already in existence when the emperor Diocletian (284-305) reorganized the oriental frontier. It may have been created by Aurelian (270-275), who sent western soldiers to the east after the annexation of the Palmyrene Empire.
The number four was the logical choice, because there was already a
third legion (Cyrenaica)
in Arabia.
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