Prince Augustus of Prussia - Wikipedia

Prince Frederick, Duke of York and Albany - Wikipedia

Chrétien-Adolphe d'Erbach-Schönberg, The Royal Prussian Wiki

Prince Friedrich Karl of Prussia (1828–1885) - Wikipedia

Wilhelmine von Preußen, The Royal Prussian Wiki

Karl August von Hardenberg - Wikipedia

List of monarchs of Prussia - Wikipedia

Frederick William III of Prussia - Wikipedia

Prince Adalbert of Prussia (1811–1873) - Wikipedia

Prince Sigismund of Prussia (1896–1978) - Wikipedia

Frédéric-Auguste II de Saxe, The Royal Prussian Wiki