Mitra said to be the same as Mithras
The name Mithra was adopted by the Greeks and Romans as Mithras, chief figure in the mystery religion of Mithraism. At first identified with the Sun-god Helios by the Greeks, the syncretic Mithra-Helios was transformed into the figure Mithras during the 2nd century BC, probably at Pergamon.  This new cult was taken to Rome around the 1st century BC and was dispersed throughout the Roman Empire. Popular among the Roman military, Mithraism was spread as far north as Hadrian's Wall and the Germanic Limes.