Which ruler divided rome in order to bring stability to the empire? constantinople maximian diocletian attila the hun

The correct answer is C) Diocletian.

The ruler that divided Rome in order to bring stability to the empire was Diocletian.

After many inept rulers that compromised the grandiose of the Roman Empire, Diocletian was a smart and brave Emperor that considered that such a big extension of territorial empire should be divided in order to better rue those lands. So he split the Roman Empire in two, naming his son-in-law, ruler of the West. His name was Maximilian and later changed his mane to Marcus Aurelius Valerio.  Diocletian decided to rule the East part of the Empire, but problems never stopped. The Roman Empire was too vast to be controlled by two rulers.