Otto, Duke of Austria
After the death of Henry of Carinthia, Emperor Louis the Bavarian gave Carinthia and the southern part of the Tyrol as an imperial fief on May 2, 1335, in Linz. Otto was enthroned as duke in accordance with the old Carinthian rite on the Zollfeld, and, from that time onwards, took care of Carinthia rather than of the Duchy of Austria. He founded the Neuberg Abbey at Neuberg an der Mürz in Styria and the Chapel of Saint George in the Augustine Church in Vienna. In February 1335, he married Anna, the sister of Emperor Charles IV in Znojmo. In 1337 he founded the knightly order Societas Templois for the crusade against the pagan Prussians and Lithuanians. His nickname the Merry refers to the festive life at his court.
Marriages and children 
- Frederick II, Duke of Austria (Habsburg) (10 February 1327 – 11 December 1344). Co-ruler with his younger brother.
- Leopold II, Duke of Austria (1328 – 10 August 1344). Co-ruler with his older brother.
Elizabeth of Bavaria died on 25 March 1330. Otto remained a widower for almost five years. On 16 February 1335, Otto married his second wife Anna of Bohemia. She was a daughter of John I of Bohemia and his first wife Elisabeth of Bohemia (1292–1330). They would have no children. She died on 3 September 1338.
Otto had four illegitimate sons who appear in genealogies. The identities of their mother or mothers and their later fates are unknown:
|This section does not cite any references or sources. (August 2012)|
|Ancestors of Otto, Duke of Austria|
Otto, Duke of AustriaBorn: 23 July 1301 Died: 17 February 1339
|Duke of Austria and Duke of Styria
co-ruler to Albert II
|Duke of Carinthia
jointly with Albert II
|Wikimedia Commons has media related to: Otto, Duke of Austria|
- Cawley, Charles, His listing along with his siblings . The project "involves extracting and analysing detailed information from primary sources, including contemporary chronicles, cartularies, necrologies and testaments.", Foundation for Medieval Genealogy, retrieved August 2012
- Marek, Miroslav. "A listing of descendants of Rudolph I of Germany, including Otto and his children". Genealogy.EU.