Question: The following is a family tree for the Kings of the Hellenes of the House of Schleswig-Holstein-Sonderburg-Glücksburg, which ruled Greece between the election of Prince Wilhelm of Denmark (George I) to replace Otto of Greece in 1863, who was born Prince William of Schleswig-Holstein-Sonderburg-Glücksburg, on 24 December 1845, and was King of Greece from 1863 until his assassination in 1913?
Answer: George I