Change faction ruler

[Ser Daeron]

Which file can I edit to change the ruler of a faction?

 

[Tasak]

(faction_set_slot, "fac_kingdom_x", slot_faction_leader, "trp_kingdom_x_lord"), and others in game_start script. Check this out to learn more: https://forums.taleworlds.com/index.php?threads/complete-guide-to-adding-factions.334271/.