skos:altLabel | - Friedrich Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
- Friedrich Ferdinand zu Schleswig-Holstein-Sonderburg-Glücksburg
- Prince Friedrich Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Glucksburg
- Frederick Ferdinand
- Frederick Ferdinand, Duke of Schleswig-Holstein
- Friedrich <br />Ferdinand
- Friedrich Ferdinand
- Frederick Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
- Frederick Ferdinand, Duke of Schleswig-Holstein-Sonderbug-Glücksburg
- Friedrich Ferdinand, Hereditary Prince of Schleswig-Holstein
- ''Friedrich Ferdinand'' Georg Christian Karl Wilhelm, Duke of Schleswig-Holstein
- Friedrich Ferdinand of Schleswig-Holstein-Sonderburg-Glücksburg
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