What is a common theme in the change in leadership of the Roman Empire from 235-285 CE?

The Crisis of the Third Century (also known as the Imperial Crisis, 235-284 CE) was the period in the history of the Roman Empire during which it splintered into three separate political entities: the Gallic Empire, the Roman Empire, and the Palmyrene Empire.

Explanation:

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the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

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what started the norman conquest?

profound political, administrative, and social changes in the british isles. last line of my information: )