Spoiler Alert, click show to read: 
-At least the year 172BC
-Have more than 6 Latifundia built in Italy
-Hold at least 45 settlements
-Fight more than 250 battles
-Have a character that is:
Sharp/Charismatic/Vigorous
Popularis
Consul or Ex-Consul
Has Influence > 2
Has Command > 2
OR
-Conquer 90 settlements.


Dunno if that will help you, personally never got that far.

BTW you using the script, I assume you are if you got the Polybians, but you gotta ask.