There was a leak about a week ago that basically revealed all (or almost all) the leaders/civilization that will be present in Civ VI base game in a dev strean... scroll down for that info!
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A * indicates this civ has not been officially revealed but was leaked in the stream.
1. America – Theodore Roosevelt
2. Arabia – Saladin *
3. Athens – Pericles **
4. Aztec – Montezuma
5. Brazil – Pedro II
6. China - Qin Shi Huang
7. Egypt – Cleopatra
8. England – Victoria
9. France - Catherine de Medici
10. Germany - Frederick Barbarossa
11. India – Gandhi *
12. Japan - Hojo Tokimune
13. Kongo - Nzinga Mbemba *
14. Norway - Harald Hardrada *
15. Rome – Trajan *
16. Russia – Peter the Great (only the word “Peter” was shown, but this is what is assumed) *
17. Scythia – Tomyris
18. Spain – Phillip II
19. Sparta – Gorgo **
20. Sumer – Gilgamesh *
* there is some debate about whether or not Gorgo and Pericles will be alternative leaders for Greece but I think that's unlikely because no other civ has more than 1 leader and what seems more likely to me is that Sparta and Athens are separate civs.
