Descendancy for Helewidis

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1 Helewidis ^[1]
- Everhard I Radulf van Mortagne
  - 2 Walter van Mortagne ^[1.1]
    - Petronella
      - 3 Everhard II van Mortagne ^[1.1.1]
        
        Richildis van Henegouwen
        
        4 Everhard Radulf III van Mortagne ^[1.1.1.1] [ =>]
  - 2 Ida van Mortagne ^[1.2]
    - Wouter d' Oisy
      - 3 Nicolaas d' Oisy ^[1.2.1]
        
        Machteld van Namen
        
        4 Jacobus van Avesnes ^[1.2.1.1] [ =>]