"Welf I (c. 1030/1040 – died 6 November 1101, Paphos, Cyprus) was Duke of Bavaria from 1070 to 1077 and from 1096 to his death. He ...
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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." - (en.wikipedia.org 23.12.2019)
