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Charlemagne is a Frankish and Holy Roman leader in the Civilization games.

Civilization III

Charlemagne is a French Military Leader.

Civilization IV

Charlemagne is also the name of both a Great General and a scenario for Civilization IV: Beyond the Sword.

Civilization V

The main article has not been created for (or Charlemagne is not part of) Civilization V

Charlemagne leads the Franks in two mods for Civilization V (available here and here).

Civilization VI

Charlemagne leads the Franks in the Vikings, Traders, and Raiders! scenario.

Other games

Charlemagne is not present in (or the article has not been created for) the following games :

Game Article
Civilization VII Charlemagne (Civ7)
Civilization Revolution Charlemagne (CivRev)
Civilization Revolution 2 Charlemagne (CivRev2)
CivWorld Charlemagne (CivWorld)
Freeciv Charlemagne (Freeciv)
Civilization: Call to Power Charlemagne (CTP1)
Call to Power II Charlemagne (CTP2)
C-evo Charlemagne (C-evo)
Sid Meier's Colonization Charlemagne (Col)
FreeCol Charlemagne (FreeCol)
Civilization IV: Colonization Charlemagne (Civ4Col)
Starships Charlemagne (Starships)

Not in the following games

It has been confirmed that Charlemagne is not present in the following games :

Civilization II
Civilization: Beyond Earth
Sid Meier's Alpha Centauri‎

Future technology (CivRev)
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