Code:
; >>>> start of diplomacy section
faction_relationships romans_julii, allied_to romans_scipii, romans_senate
faction_relationships romans_julii, at_war_with gauls, greek_cities
faction_relationships romans_scipii, allied_to romans_julii, romans_senate
faction_relationships romans_scipii, at_war_with greek_cities
faction_relationships romans_senate, allied_to romans_julii, romans_scipii
faction_relationships romans_senate, at_war_with greek_cities
faction_relationships gauls, at_war_with romans_julii, greek_cities
faction_relationships greek_cities, at_war_with romans_julii, romans_scipii, romans_senate, gauls, thrace
faction_relationships thrace, at_war_with greek_cities
As you can see, the set up is basically: