The unity collapsed into a series of fratricidal wars. Prince Oleg "The Misery-Maker" Svyatoslavich famously used Polovtsian mercenaries to attack his own kin, devastating the countryside. This era was defined by the "Lubech Congress" in 1097, where the princes finally met to agree on a new rule: "Let each keep his own patrimony," effectively ending the idea of a single united state.
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Following the death of Grand Prince Yaroslav the Wise, his sons initially shared power in a "Triumvirate." By 1057, the fragile peace held, but the seeds of discord were sown. The nomadic Polovtsy (Cumans) began their first major incursions into the southern steppes, forcing the princes to choose between unity and personal ambition. The unity collapsed into a series of fratricidal wars