Christian IX of Denmark (April 8, 1818 – January 29, 1906) was King of Denmark from November 15, 1863 to January 29, 1906.
They were also heirs of Frederick III, through their one ancestress who was daughter of King Frederick V of Denmark, and they were a more junior agnatic heirs eligible to succeed in Schleswig- Holstein.
In November 1863 Frederick of Augustenborg claimed the twin-duchies in succession after King Frederick VII of Denmark, who also was the Duke of Schleswig and Holstein, and who had died without a male heir.
Frederick's sole desire was for peace in Germany, even if to secure this he had to make the greatest sacrifices; and for this reason, he granted to the ecclesiastical and temporal lords a series of privileges, which subsequently developed into the independent sovereignty of these princes.
Frederick had also been obliged to acknowledge the pope as his overlord in Sicily, thus abandoning his father's cherished hopes of uniting Sicily with the imperial crown of Germany, though the attempts of the pope to entirely nullify this "personal union" were far from successful.
Frederick had been forced to pledge himself to take part in a new crusade, for which inadequate preparations had been made by the pope, and the Council of Lateran (1215) fixed 1 June, 1216, as the time for beginning the crusade.