I dont know if this is going to help but i think this has some information you can use
The visigoths led by king Alaric
here also
The Sack of Rome occurred on August 24, 410. The city was attacked by theVisigoths<span> led by King Alaric. At that time, Rome was no longer the capital of the Western Roman Empire, having been replaced in that position first by Mediolanum in 286 and then by Ravenna in 402</span>
what are you asking exactly
Answer:
an empire united under a single ruler
Explanation: