The article explores the genesis of corruption practices in Russia using the example of the institution of «feeding» and the related phenomena of «bribes» and «secret bribes» in the 11th–16th centuries. Based on an analysis of archival sources (charters, investigation files, petitions, and account books), the article reveals the mechanism of transformation of legal forms of administration into systemic abuses. The authors conclude that informal practices were inherent in the feeding system, and their elimination required profound institutional reforms. In conclusion, the article draws parallels with the current challenges of Russia's anti-corruption policy, demonstrating the influence of historical models on the perception of public service and the need for a systematic approach to combating corruption.