Hey this is a question for my Kiev Rus game (and first SS game). I play with no submods and BG disabled as the 6.1 patch allowed for.
I was allied to Poland for most of the game, but some turns after I took Constantinople something odd happened. At this time the Pope had called a crusade on Cairo and quite a few nations including the English and the Poles.
One English army must have gotten lost by moving into the Ukraine (wtf AI cannot use merc boats?) and I "helped" it get away by assassinating their general and they quickly disappeared.
But some turns later I got the message "Betrayed!" and to my wonder I was suddenly at war with the Polish. Strangely enough none of my ports were blockaded by Polish ships and none of my settlements were sieged. The only sign of agression was a Polish crusading stack trying to move past Constantinople but stopped by my ZoC.
So Why are we at war? Does just moving into another's terrain constitute an act of agression now? (that would be nice if the AI actually understood that).
About 5-10 turns later I sent a maurading stack of cav and got a heroic defeat against a polish one and a settlement, but since I released the prisoner the settlement didn't fall. A couple of turns later the Polish sued for peace (after doing absolutely no aggressive act towards me) which I gave them for some nice tribute.
So what's up? I'm fairly certain the AI had no intention to actually backstab me. Could it be a failed assassination attempt? If so, shouldn't I get some message of that?