Church Statute of Prince Yaroslav

The Church Statute of Prince Yaroslav is a source of church law in Kievan Rus', defined legal authority of church by the prince (knyaz), his administration and churchmen. Yaroslav's Statute was a short legal code, regulated relationship between the church and the state, including demarcation of jurisdiction between church and princely courts, index of persons within the church jurisdiction, rules of family law (family law belonged to church jurisdiction) and sanctions against moral violation.

Source: Wikipedia — Church Statute of Prince Yaroslav (CC BY-SA 4.0)