I'm digging into the XML now.
5
Alexander
Bismark
Brennus
Genghis
Huayna Capac
Isabella
Julius Caesar
Louis XIV
Mehmed
Montezuma
Pacal
Qin Shi Huang
Ragnar
Shaka
Sitting Bull
Stalin
Tokugawa
10
Asoka
Boudica
Cyrus
Darius
De Gaulle
Frederick
Hammurabi
Hannibal
Hatshepsut
Kublai Khan
Lincoln
Napoleon
Saladin
Suleiman
Suryavarman
Victoria
Wang Kon
Washington
Zara Yaqob
15
Augustus
Catherine
Charlemagne
Churchill
Elizabeth
Gandhi
Gilgamesh
Joao
Justinian
Mao Zedong (it's interesting to note that in the CIV4LeaderInfo XML, his TXT_KEY is just 'Chinese Leader')
Pericles
Peter
Ramesses
Roosevelt
Williem
20
Mansa Musa
Oh, and, Sid Meier's is 0.