Creating Rome possible with threat level ?

[Arsonik]

Does this one count? First time for me about a week ago
I haven't played it since to be honest. Both muslim blobs have 50k+ manpower, similar to my own. Abbablob just called jihad for Jerusalem and I really am not feeling like dealing with it right now lol.

 

[Dragatus]

Note that breaking truce only reduces the opinion of independent rulers. Your vassals won't care, even if you break truce with someone of the same religion. The -5 Diplomacy penalty also doesn't stack, you only get the modifier once. You do lose Prestige, but you only get 10 opinion bonus from it at most and you'll get some back during the war anyway.

So it's really quite feasible to get away with constant truce breaking. All the other rulers will hate you, but that only matters if you want to arrange marriages or form alliances. If you're doing a holy war or imperial reconquest spree it doesn't really matter what they think.

 

[StarSword]

I overran a defensive pact of most of India, including the Followers of Arjuna, in a holy war as Persian Emperor over the weekend. The trick if you're basically landlocked as I was is to marshal a decent size stack of retinues in a border province with good local levies close by (belonging to the Shahs of Baluchistan and the northern half of Sindh in my case) before issuing your war declaration, then storm the border immediately while you get your core forces moving. If you can deploy by sea, do that instead, and don't be afraid to retreat to the ships and reposition.

The enemy outnumbered what I deployed to capture Sauvira by almost two to one, but because AI they came in as dribs and drabs and I was able to use my more concentrated forces to squash them piecemeal. It also pays major dividends to have at least one commander with Siege Leader or Architect (my 70-year-old Lunatic emperor in this case, which was interesting by itself): Assault the castles and then you can quickly siege down any cities or temples. War was over in about a year.

So, essentially what I'm saying is, beating a pact at high threat is possible, you just need to shift your tactics a little.