You can find the names of the military and the scientific great leaders of Civ 3 Conquest in the editor by opening the civilizations register. Here is a screenshot of some of the names of the military and scientific great leaders of Greece. Not all of those names can be shown in a screenshot by the Firaxis editor. Per example Greece has 9 names for scientific great leaders. Please understand, that I don´t write down here the names of hundreds of great leaders in C3C for 31 civilizations.
View attachment 624460
The great leaders in Civ 4 (especially the great artists) were developed from the enslavement system in C3C. Therefore in the C3C mod CCM 2.50 you also have great artists and per example Greek heroes, using the names of different antique heroes by linking those units to the military leader name function.