Answer:
The Roman pull-out from Britain
Explanation:
When the Romans left Britain, various groups of people started infighting over supremacy on the islands. The anglo-saxons used this to completely conquer the land which was an easy job for them considering how advanced their warriors were compared to the locals. Normans actually ended anglo-saxon rule much later. Credit to Greenleafable for this answer and explanation btw.
Setting is the answer because it is describing the place
In Osaka, Japan and it's in the 18th centenary
hope this helps!
Dr. Lanyon is an intelligent, respectable lawyer who is suspicious the "Mr. Hyde" is threatening or bullying Dr. Jekyll into giving him property and leaving money for him in his will. Because Dr. Lanyon is an intelligent man, he always looks for a logical, practical answer, which is why he does not wonder is Hyde and Jekyll are the same person.