Question of Schleswig-Holstein in the 1850s and 1860s; so as not to offend Danish national feelings, he was married in 1820 to a Danish relative, Countess of Danneskjold-Samsoe (Lovisa-Sophie Danneskjold-Samsøe, 1797–1867), a kinswoman of the kings of Denmark, belonging to a bastard branch of House of Oldenburg; Duke Christian sold his rights to the Duchy of Schleswig-Holstein to Denmark in aftermath of Treaty of London but later renounced his rights to the Duchy of Schleswig-Holstein in favor of his son Frederick August; he was the brother-in-law of King Christian VIII of Denmark, nephew of Frederick VI of Denmark, and father of, amongst others, Frederick August (Friedrich Christian August), Duke of Schleswig-Holstein-Sonderburg-Augustenburg (born 1829 in Augustenborg, he was nephew of the Danish king himself, after whose death in 1863 he claimed to succeed as Duke of Schleswig-Holstein; died in 1880, leaving one surviving son and a number of daughters). Frederick Emil August (born 23 August 1800 in Kiel; died 2 July 1865 in Bayreuth), the “Prince” of Nør (Noer); he was married in 1829 to Countess Henriette Danneskjold-Samsøe (1806–1858), a Danish noblewoman belonging to a bastard branch of the House of Oldenburg; in 1864, he was created Prinz von Noer ("Prince of Noer"); he was father of: Friedrich Christian Karl August (born in Gottorp in 1830; died in Noer in 1881), who married Carmelita Eisenblat; and Luise Karoline Henriette Auguste, Graefin von Noer (born in Schleswig in 1836; died in 1866), who married Michael Vlangali-Handjeri. Over the years, conflict arose between Duke Frederick Christian II and Louise Auguste's brother, King Frederick VI of Denmark, especially over the relationship of the double-duchies of Schleswig-Holstein and the Duke's own small appanage around Sonderborg on the one hand and the Danish monarchy on the other. His wife remained loyal to the Danish royal house throughout these differences. The marriage eventually fell into acrimony and reproach, and Frederick Christian tried to legally limit Louise Auguste's influence over their children's futures. In 1810, Frederik Christian's younger brother Charles August was chosen by the estates of the Swedish realm as that nation's crown prince, to succeed the elderly and childless King Charles XIII. Following Charles August's death in May 1810, Frederick Christian himself was the leading candidate to become the new heir to the Swedish throne. On 8 August 1810 he was elected crown prince by the estates. His election however, was reconsidered and withdrawn two weeks