It looks like there might be a small confusion with the word "maximian." The term you mentioned refers to a historical figure, specifically a Roman emperor, rather than a standard English word used in everyday conversation.
Maximian (noun) refers to a Roman emperor who ruled from 286 until he abdicated in 305 AD. He was one of the co-emperors when the Roman Empire was divided into the Western and Eastern parts. Maximian was the emperor of the Western Roman Empire and worked with Emperor Diocletian, who ruled the Eastern part. Maximian died in 311 AD.
In more advanced discussions, you might explore topics like the policies of Maximian, his military campaigns, or his relationship with Diocletian.
The name "Maximian" specifically refers to the historical figure and is not commonly used in modern English to denote anything else.
Since "Maximian" is a proper noun, it does not have idioms or phrasal verbs associated with it. However, in historical contexts, you might encounter phrases like "the fall of the Roman Empire," which can relate to discussions about all emperors, including Maximian.
To sum up, "Maximian" is a specific name referring to a Roman emperor and is mainly used in historical discussions.