Unlike Medieval Total War, in this game you'll get backstabbed only for a good reason, like conquering and pillaging provinces of your allys ally (or other faction with whom your ally is in good terms, has marriage agreements etc.) or if your relations with your ally (or vassal) are very bad.
Keep good relations with your allies and especially vassals, keep kingdom power at +5 and you'll be just fine.
Vlad_Dracul
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