Welf, Duke of Carinthia
Welf III as he is numbered in the genealogy of the Swabian line of the Elder House of Welf
Elder House of Welf
The Elder House of Welf was a dynasty of European rulers in the 9th through 11th centuries to 1055. It consisted of two groups, a Burgundian group and a Swabian group. It is disputed whether the two groups formed one dynasty or whether they shared the same name by coincidence only.-Burgundian...

, was the duke of Carinthia and margrave of Verona from 1047. He was the only son of Welf II
Welf II
Welf II was a Swabian count and a member of the Elder House of Welf.He opposed the election of Conrad II in 1024 because it did not suit his interests, but he had to eventually relent....

, Count of Altdorf, and Imiza.

Carinthia was the last German duchy to be held personally by the Emperor Henry III before he gave it to Welf. Welf III never married and had no children when he died at his castle on Lake Constance
Lake Constance
Lake Constance is a lake on the Rhine at the northern foot of the Alps, and consists of three bodies of water: the Obersee , the Untersee , and a connecting stretch of the Rhine, called the Seerhein.The lake is situated in Germany, Switzerland and Austria near the Alps...

 in 1055. He bequeathed his property to the monastery of Altdorf, where his mother was abbess. She in turn gave the property to Welf IV
Welf I, Duke of Bavaria
Welf I was duke of Bavaria from 1070 to 1077 and from 1096 to his death. He was the first member of the Welf branch of the House of Este. In the Welf genealogy he is counted as Welf IV.-Life and reign:...

, the son of Welf III's sister Chuniza and Albert Azzo II, Margrave of Milan
Albert Azzo II, Margrave of Milan
Alberto Azzo II , Margrave of Milan, and Liguria, Count of Gavello and Padua, Rovigo, Lunigiana, Monselice, and Montagnana, aka, Albertezzo II, was a powerful nobleman in the Holy Roman Empire...

. Welf was the last of the Elder Welfs, his lands went to the senior branch of the House of Este, which is called the Younger House of Welf. His duchy went to Conrad III
Conrad III, Duke of Carinthia
Conrad III, count of the Zulpichgau, was Duke of Carinthia from 1056 until his death in 1061. He was son of Hezzelin I, brother of count palatine of Lotharingia, Ezzo....

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