context: In 284, Diocletian appointed General Maximianus as the Caesar, and in June 285 he finally reigned Carinus in Mosia and became a full emperor. On April 1, 286, Maximianus was promoted back to Augustus and jointly ruled the empire. Diocletian then reorganized the defense of the Donau River for two years, then returned to the east in 288, taking over half of the province of Mesopotavia from King Perah, King Bahram II, and ascending to the Kingdom of Armenia.
question: Who is the co-reign of Diocletian's Bath?
answers.text: Maximianus