Code:
faction romans_scipii, bureaucrat napoleon
superfaction romans_senate
denari 5000
settlement
{
level large_town
region Campania
year_founded 0
population 4800
plan_set default_set
faction_creator romans_julii
building
{
type barracks militia_barracks
}
building
{
type core_building governors_villa
}
building
{
type defenses wooden_pallisade
}
building
{
type hinterland_roads roads
}
building
{
type hinterland_farms farms+1
}
}
settlement
{
level large_town
region Sicilia_Romanus
year_founded 0
population 3500
plan_set default_set
faction_creator romans_julii
building
{
type barracks muster_field
}
building
{
type core_building governors_villa
}
building
{
type defenses wooden_pallisade
}
building
{
type hinterland_roads roads
}
}
Remember always to make backups when changing files
Also, you might want to change the level of the cities to huge_city before adding those stuff.