"He built a second capital in the East, which led to the division of the Empire" would be the best way to describe how Diocletian affected the Roman Empire, since it had grown to a state where managing it under a single entity was too difficult.
I would say the answer is Visigoths.
Explanation:
im pretty sure he loved it. he was confused at first but was amazed about all the cool stuff there is. that and he thought the magical world was his true home.
The romans used D) aqueducts