Saint Leopold of Austria, also known as Saint Leopold III, was a 12th-century nobleman and the Duke of Austria. He is celebrated for his piety, dedication to the Church, and efforts to promote peace and justice in his realm. Leopold was instrumental in the development of the region and is often remembered for his charitable works and support of the poor. Leopold was canonized as a saint by the Catholic Church due to his virtuous life and commitment to Christian values. His feast day is observed on November 15, and he is regarded as the patron saint of Austria and the Austrian state of Lower Austria.