How to add a city

[Plantagenet]

Ok, I just took a peek myself, and it seems Tripolitania isn't owned by anyone at campaign start, which should make this easier (no Family Members or other factions to mess with). Go down to "faction slave, balanced smith", and then scroll down past the rebel cities until you see the rebel armies. At the very bottom, you'll find:

;Tripolitania
character, sub_faction carthage, Gelon, general, command 0, influence 0, management 0, subterfuge 0, age 20, , x 96, y 19
army
unit carthaginian city militia exp 1 armour 0 weapon_lvl 0
unit carthaginian city militia exp 1 armour 0 weapon_lvl 0

Delete this rebel army and see what happens.