Otto, Duke of Austria
Otto IV, the Merry , a member of the House of Habsburg, was Duke of Austria and Styria from 1330, as well as Duke of Carinthia from 1335 until his death. He ruled jointly with his elder brother Duke Albert II.
Otto was born in the Austrian capital Vienna, the youngest son of King Albert I of Germany and Elizabeth of Carinthia, a member of the House of GoriziaTyrol . His elder brothers were Rudolf III, who beame King of Bohemia in 1306, Frederick the Fair, elected King of the Romans in opposition to Louis the Bavarian in 1314, the Austrian dukes Leopold I and Albert II as well as Henry the Friendly.
Source: Wikipedia