The two basic criteria are: Emperor & Empire.
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An empire, Wealth (To make their development sustainable) etc...
The greatest European powers included Rome, Holy Roman Empire, France, and the Byzantine Empire.
Which empire?The Diocletian
"Empire-building".
The biggest Empire in the world was the British Empire, it was the biggest Empire the world has ever seen by far! It stretched right around the globe and a saying was born "the sun never sets on the British empire" because a part of the empire was always in daylight. Here is a map of the world, bits marked red was under British rule: http://northbritain.files.wordpress.com/2008/10british-empire-1920.jpg AS a matter of fact the mongolian empire was the biggest ever seen It was ruled by chinggis khan. And it was 4 times the roman empire at its peak. However, when chinggis khan died, the empire shrunk a lot. The empire is the size of Europe and china together!