The commonality between the emperors of China and Japan with the kings and tsars of Europe and the sultans and shahs of the Muslim world is the concept of monarchy.
The concept of monarchy can be described as a form of political strategy or government which operates on the absolute sovereignty of land or territory under a single command of an individual.
It is also a situation whereby a single ruler exercises absolute power over the land, where he operates as the head of States and often assumes the position through blood or family line.
Hence, in this case, the correct answer is "Concept of Monarchy."
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