Leopold III, known as Leopold the Good, was the Margrave of Austria from 1095 to his death in 1136. He was a member of the House of Babenberg. He was canonized on 6 January 1485 and became the patron saint of Austria, Lower Austria, Upper Austria and Vienna. His feast day is 15 November.

The House of Babenberg was a noble dynasty of Austrian Dukes and Margraves. Originally from Bamberg in the Duchy of Franconia, the Babenbergs ruled the imperial Margraviate of Austria from its creation in 976 AD until its elevation to a duchy in 1156, and from then until the extinction of the line in 1246, whereafter they were succeeded by the House of Habsburg, to which they were related.