/Arnulf I "the Great" of Flanders
        /Baldwin III of Flanders
       |    \Alice\Adela de Vermandois
    /Arnulf II of Flanders
   |   |    /Herman Billung
   |    \Matilda Billung
Baldwin IV 'Fair Beard' of Flanders
   |        /Adalbert the Rich of Ivrea
   |    /Berengar II of Italy
   |   |    \Gisèle de Frioul
    \Rozela of Italy
        \Willa of Tuscany
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