The Legio I Illyricorum was a Roman Legion stationed in Qasr el-Azraq and Palmyra; it is mentioned in the Notitia Dignitatum.[1] According to many ancient sources, it was stationed within the Eastern Half of the Roman Empire, under emperor Aurelian.
^Kaiser, Anna Maria (2015). "Egyptian Units and the Reliability of the Notitia Dignitatum, pars Oriens". Historia: Zeitschrift für Alte Geschichte. 64 (2): 243–261. JSTOR24433912.