Marcus Aurelius Antoninus is a name that is associated with the Roman Empire. It may be difficult to find synonyms for such a specific name. However, there are alternate versions of the name that can be used. For example, he is also commonly known as Marcus Aurelius or simply Aurelius. Additionally, in Latin, his full name is Marcus Aurelius Antoninus Augustus. Other synonyms that can be used to refer to him may include "Emperor Marcus," "Antoninus the Great," or simply "Marcus the Philosopher." Regardless of how one chooses to refer to him, Marcus Aurelius Antoninus was a significant figure in history and is often remembered for his philosophical writings and leadership as emperor.