 Under the Polish-Lithuanian Commonwealth's last king, Stanisław August Poniatowski (reigned 1764–95), the Polish Enlightenment was radicalized and came under French influence.The philosophical foundation of the movement ceased to be the Rationalist doctrine of Wolff and became the Sensualism of Condillac.This spirit pervaded Poland's Commission of National Education, which completed the reforms begun by the Piarist priest, Stanisław Konarski.