Diplomatic behavior of Factions

[Iberia Auxilia]

Does the victory conditions of each faction affect the aggressiveness of respective factions and their tendency of allying other factions?
Hoping for responds

[Myth]

Not the victory conditions, but some nations are always agressive. In vanilla M2TW the Milanese and Danish always start wars. Portugal almost always tries to disembark on the British isles. The Byzantines and Turks have at it since turn #1, so on and so forth. Also, on VH your diplomatic relations will worsten towards 0 with every passing turn by themselves, and you will always get backstabbed sooner or later.

[Visor]

Byzzies on VH end up facing Turks/Egypt/Venice/Sicily/PS/Hungary and possibly Poland.

At least I am. (Except for Turks, I killed them round turn 5.)

Basically all nations will attack you. Treat the AI like a piece of meat and not Napolean and you will win your campaigns. If you border them they will attack you. If you are too big they will attack you.

[Old Geezer]

It somewhat depends on the version that you are playing. If you play on very hard strategic difficulty, they will all gang up on you rather soon - even factions which have no chance of beating you. If you look at the victory conditions for each faction you will see why some of them always want to take a certain city. But to answer the OP's original question: yes to both, if you are playing on medium difficulty. On very hard, things can just be crazy.

[Sebastian Seth]

There is no diplomatic behavior that I have noticed...

They will attack where they can when they can. You can fend em of with diplomats sometimes if your relations are good.

Relations will suffer on pretty much everything you do. You can give em gold to better the relations (All together the relations are just one number.)
- I "bribe" the papacy usually when playing catholics. Just so that he wont call crusade on me.
- I bribe the allies too. Just to keep em from attacking my weakly defended backside.