The Statutes of Lithuania, originally known as the Statutes of the Grand Duchy of Lithuania, were a 16th-century codification of all the legislation of the Grand Duchy of Lithuania and its successor, the Polish–Lithuanian Commonwealth. The Statutes consist of three legal codes, all written in Ruthenian, translated into Latin and later Polish. They formed the basis of the legal system of the Grand Duchy and were "the first full code of laws written in Europe since Roman Law" and "a major milestone inasmuch as it is the first attempt to codify significant East European legal trends". The Statutes evolved hand-in-hand with the Lithuanian expansion into Slavic lands, thus the main sources of the statutes were Ruthenian Laws, Baltic tribes had neither written culture nor systematic laws, while the Ruthenians published codified collections of law 5 centuries before the first statute of the Grand Duchy of Lithuania. Old Slavic customary law, as well as the nobility privileges in Poland, Magdeburg Rights, international treaties and royal charters and proclamations of the 12th to 14th centuries.