I vote for Octavian Augustus. This cunning man really knew how to build an
extremely strong empire.
Others
From medieval times:
William the Conqueror,Philip II Augustus Sallah-ad-din, Genghis khan and special attention to byzantine emperors: Alexius Comnenus and John III Doukas Vatatzes (Basil II was an excellent emperor but I can not forgive him conquering Bulgaria)
And at the end some Bulgarian rulers: khan Krum (the beginning of IXth century), tzar Kaloyan (1197-1207) and Ivan Asen II (1218-1241)
Later on:the emperor of Spain and HRE Charles V, Elizabeth I of England, Maria Teresia, Peter the Great and the prussian king Friedrich-Wilhelm I
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