This thesis focuses on the life of the Roman Emperor Galerius, with special attention paid to his military campaigns in the east against the Sassanid Empire. Because of a lack of primary sources, Galerius's potential route into Armenia and his two engagements against the Sassanids have been recreated in this thesis. Potential answers to the lack of information were revealed through the analysis of primary sources from different time periods in which similar scenarios occurred between the Romans and Parthians/Sassanids. In addition to the Eastern Campaign, the Christian primary sources are scrutinized due to their bias in portraying Galerius as a bloodthirsty monster. Overall, this thesis puts forth potential answers to the missing information about Galerius's campaign in the East and recreates his legacy as an important figure in Roman history, not just an individual who persecuted Christians.