Margrave Ernest of Austria, the Brave (1027 – June 10, 1075 at Homburg an der Unstrut) was a Babenberg ruler of Austria from 1055 to 1075, following his father Adalbert. He increased the territory by amalgamating the Bohemian March and the Hungarian March into Austria. In his time, the colonization of the Waldviertel began by his ministerials, the Kuenringer knights. In the Investiture Controversy, he sided with Emperor Henry IV and in a battle against the Saxons.