Antoni Tyzenhaus (1733 – March 31, 1785) was a noble from the Tyzenhaus family, son of Benedykt Tyzenhaus. As a personal friend of Stanisław August Poniatowski, the King of Poland and Grand Duke of Lithuania, Tyzenhaus became Treasurer of the Grand Duchy of Lithuania and administrator of royal estates. He began to implement various agricultural reforms and pioneered industrialization in an effort to increase productivity and economic power of the Polish–Lithuanian Commonwealth. At first, he was successful and managed to gain considerable political influence; he was considered to be the second man after the King. However, the efforts were based on the old system of serfdom (forced labor) and failed. Eventually, amidst increasing political rivalry with other nobles and mounting debts, Tyzenh