| skos:altLabel | - Prince William
- William
- William I
- uncle
- Prince of Hesse
- Wilhelm I
- William IX
- Landgrave of Hesse-Kassel
- William of Hesse
- Count William
- Hereditary Prince William, Ruling Count of Hesse-Hanau
- Der Kurfürst von Hessen
- Hereditary Landgrave William
- Landgraf Wilhelm von Hessen-Kassel
- Landgrave Wilhelm
- Landgrave Wilhelm (William) IX of Hesse
- Landgrave William IX of Hesse
- Landgrave and Elector of Hesse
- Prince William IX
- Prince William of Hesse
- Landgrave William IX of Hesse-Kassel (or Hesse-Cassel)
- The Hereditary Prince of Hesse-Cassel
- Wilhelm (William) IX, Landgrave of Hesse
- Wilhelm I, Elector of Hesse
- Wilhelm I., Kurfürst von Hessen
- Wilhelm IX
- Wilhelm IX/I of Hesse-Kassel
- Wilhelm, the then heir apparent of Hanau
- William I of Hesse
- William I of Hesse-Kassel
- William IX, Landgrave of Hesse-Kassel
- William XIII
- William of Hesse-Kassel
- elector William I
- prince-elector William
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