Welf I (c. 1035/1040 – 6 November 1101) 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 genealogy of the Elder House of Welf he is counted as Welf IV .
IV, the new duke (as Welf I) of Bavaria, and with Rudolf, the duke of Swabia, Henry was forced to grant immunity to the rebels in 1073 and had to agree to the razing of the royal Harz Castle in the final peace treaty in February 1074.
Count of Altdorf, Count in Swabia, Duke of Bavaria, Count in Alemannia, Duke of Auxerre Welf I or Welfo (died before 876) was a Swabian nobleman. He was a member of the Elder House of Welf. Welf originated from a distinguished dynasty of Franconian nobles.
Guelph I (Welf I) Duke of Bavaria was born at of Altdorf, Bavaria Abt 776. His parents were Ruthardus (Raduald) , Duke of Fruili and . He married Hedwig Duchess of Bavaria .
Welf I Duke of Bavaria was born about 787 in Altdorf, Bavaria, Germany, son of Isembhard von Thurgau. He was married to Edith Hedwig of Saxony, they had 7 children. He died about 818 in Altdorf, Bavaria, Germany. This information is part of by on Genealogy Online.
- Edith Hedwig of Saxony, Edith Hedwig of
Welf IV became duke of Bavaria as Welf I, in 1070. He abandoned his alliance with the Holy Roman emperor Henry IV to become an important supporter of the papal party in Italy. His 17-year-old son, Welf V (later Welf II of Bavaria), married the 43-year-old countess Matilda of Tuscany in 1089; the marriage ended in separation.
Welf I, Duke of Bavaria. Welf I (died 6 November 1101, Paphos) 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. Welf was the son of Azzo II of Este and his wife Chuniza of Altdorf.
- Welf II, Duke of Bavaria, Henry IX, Duke of Bavaria, Kunizza of Bavaria
- Albert Azzo II, Margrave of Milan
He was installed in 1070 as WELF I Duke of Bavaria by Heinrich IV King of Germany. Duke Welf supported Rudolf von Rheinfelden, anti-king of Germany, and was deposed as Duke of Bavaria in 1077 by Heinrich IV.
The relationship between Welf I and all later members of the Swabian group (Welf, Duke of Carinthia, and his relatives, who were counts of Altdorf) is, again, known only through legend. The Elder House of Welf became extinct when Welf, Duke of Carinthia, died childless in 1055.