Question: Who is the paternal grandfather of Princess Barbara Of Prussia?
Sentence (from "Prince Sigismund of Prussia (1896–1978)"): Prince William Victor Charles Augustus Henry Sigismund of Prussia (27 November 1896 at Kiel – 14 November 1978 at Esparza, Costa Rica), was the second son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine.
Relevant evidence: Yes