Early settlers had to choose a location that would meet their most basic needs. Therefore, the early settlers of Mesopotamia, Egypt, India, China, and Rome all settled near

They would need food and water so if they settled by a river or coastline they would have access to both food and water plus they could irrigate their crops from the water source

I hope this helps in some way

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: