Русская Правда
The Primary Chronicle suggests Olga of Kiev changed the method of gathering tribute. The chronicle reports that Olga's husband, Igor, was killed by the Drevlians angered at his attempt to collect more tribute than it had been agreed. After his death, Olga appointed her own officials to gather and deliver tribute, at least in some of the areas of her domain, preferring not to rely on local chiefs and the system of "poliudie". Valentin Yanin suggests that Olga's reform was the first germ of the Rus' law, later codified as the Russkaya Pravda.