Answer:
Divided the empire into two halves
Explanation:
At the time when Diocletian came to power, the Roman Empire was in severe decline. He began many reforms to undo the turmoil of the last century but he is most memorable for splitting Rome into two pieces. The Eastern Roman Empire that was under him, and the Western Roman Empire that was under the rule of his colleague Maximian. He essentially saved Rome from total collapse.
The answer would be Caliph
The event you're describing is called the Ra pe of Nanking. It happened in 1937. Around 50,000 innocent Chinese people were killed by Japanese troops.
