Cyrus the Great: the OG "Great"; founder of the Achaemenid Empire, which is like the most powerful empire of the early ages right until Alexander owned Darius III
Ahsoka the Great: arguably the greatest figure from India (Maurya at the time); his empire is the largest in the long history of the sub-continent; also made Buddhism the sh*t
Alexander the Great: the most popular "Great" in history for a reason: he conquered the largest amount of land ranging from Egypt to the Middle East to parts of India; idolized by almost every great ruler and general
Constantine the Great: the greatest Roman ruler who ensured the Roman Empire lived on via the Byzantine Empire; founded Constantinople and made Christianity the dominant religion in Europe
Charles the Great: aka Charlemagne, he's known as "the Father of Europe" changed the continent via his reforms; rare figure who excelled as both a ruler and general
Honorable mentions:
Note: there are also other figures like Genghis Khan or Qin Shi Huang who are known as "Great" in their respective languages but left them out for semantic reasons
