Duke of Bavaria
1040 CE to 1101 CE
Welf I (died November 6, 1101, Paphos, Cyprus) is Duke of Bavaria from 1070 to 1077 and from 1096 to his death.
He is 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.
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