Austria, date back to Leopold's time. He is buried in the Klosterneuburg Monastery, which he founded. His skull is kept in an embroidered reliquary, which leaves the forehead exposed; it also wears an archducal hat. In 1663, under the rule of his namesake Emperor Leopold I, he was declared patron saint of Austria instead of Coloman of Stockerau. The brothers Joseph and Michael Haydn, each of whom sang in the choir of St. Stephen's Cathedral, both sang in that capacity at Klosterneuburg on this day. Joseph Haydn later became the more famous composer of the two. Michael Haydn later (in 1805) wrote a mass in honour of Leopold, the Missa sub titulo Sancti Leopoldi. Since the death of Emperor Leopold I, the King's Feast is celebrated in Belgium on Leopold's feast day. Children His first marriage, possibly to a lady of the von Perg family, was childless. By his second wife, Agnes of Germany, widow of Frederick I, Duke of Swabia: Adalbert Leopold IV ( 1108 – 1141) Henry II Jasomirgott (1107–1177) Berta, m. Henry III, Burgrave of Regensburg Agnes (c. 1108/13 – c. 1160/63), m. Władysław II of Poland Ernst Uta, wife of Liutpold von Plain Otto of Freising (c. 1114 – 1158), bishop and biographer of his nephew (from his mother's first marriage), Emperor Frederick I Barbarossa Conrad, Bishop of Passau and Archbishop of Salzburg Elisabeth, m. Hermann II of Winzenburg Judith, m. William V of Montferrat Gertrude, m. Duke (later King) Vladislaus II of Bohemia According to the Continuation of the Chronicles of Klosterneuburg, there may have been up to seven others (possibly from multiple births) stillborn or who died in infancy. In 2013, documentation regarding the results of DNA testing of the remains of the family buried in Klosterneuburg Abbey strongly favor that Adalbert was the son of Leopold and Agnes. Gallery See also List of rulers of Austria References Citations Bibliography External links Leopold III., Heiliger, Babenberger-Markgraf at AEIOU Leopold at Patron Saints Index Leopold 3 of Austria (Babenberg) Leopold 3 of Austria (Babenberg) 11th-century margraves of Austria 12th-century margraves of Austria 12th-century Christian saints Austrian Roman Catholic saints German Roman Catholic saints People from Melk Roman Catholic royal saints Founders of Christian monasteries