Principality of Bulgaria | Hanau | Principality of Ansbach | Principality of Lüneburg | Principality of Auersperg | Principality of Polotsk | Principality of Orange | Principality of Yaroslavl | Principality of Pereyaslavl | Principality of Calenberg | Principality of Lippe | Principality of Grubenhagen | Principality of Sealand | Principality of Piombino | Principality of Kiev | Principality of Catalonia | Principality of Anhalt-Zerbst | Ulrich V, Lord of Hanau | Principality of Zeta | Principality of Transylvania | Principality of Lichtenberg | Principality of Hungary | Principality of Halberstadt | Principality of Brunswick-Wolfenbüttel | Johanna Sibylla of Hanau-Lichtenberg | Battle of Hanau | Ulrich IV, Lord of Hanau | Ulrich I, Lord of Hanau | Ulrich II, Lord of Hanau | Ulrich III, Lord of Hanau |
During the lifetime of his father, William had already received the Principality of Hanau, south of the Hessian territories near Frankfurt, as successor of its newly extinct princes.
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William's grandfather, Landgrave William, granted the newly acquired principality of Hanau to his daughter-in-law and grandsons.