On my current shard in the campaign, we are all at peace :D

I managed to conquer about 1/2 of the whole shard before this pat situation occurred where noone will attack anyone else.

Now all my provinces are discovered to 100%.

I got two heroes (mages) at level 28ish.
One warrior at lvl 30 (my dragon-killer), he killed all the dragons in my provinces single-handed :D

Who is best to piss off? The tree-hugger-lady, the weird old man or the witch (whom I personal favour for her background as a self-made master)?

At the moment I do some arena fighting with the warrior for fun...

I tried to form an alliance with the witch, she refused.
Then I declared war to the tree-hugger-lady and tried to form an alliance with the witch, she still refuses.
I killed that tree-hugger-lady.
Then the old man AND the witch declared war on me.
After I took about 4 provinces from them, they both made peace again.
Then I tried to form an alliance with the witch, she still refused.
The old man was out of reach behind her provinces, so I declared war on and annihilated her.
Then the old man declared war and I killed him, too.

Noone left on the shard, game over.

But it was a good time, being able to develop every single building and explore all the stuff.