Frederick Christian II, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (28 September 1765 in Augustenburg – 14 June 1814 in Augustenburg) was a Danish prince and feudal magnate. He held the island of Als and some other castles (such as Sonderborg) in Schleswig. Life Frederick Christian II was born the eldest son of Frederick Christian I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (1721–1794), by his wife and cousin Princess Charlotte of Schleswig-Holstein-Sonderburg-Plön (1744–1770). Until his father's death, he was styled "Hereditary Prince of Augustenborg". He was a prince with an exceptionally high level of Danish blood in his ancestry: his maternal grandmother, paternal grandmother, and paternal great-grandmother having been born, respectively, Countess of Reventlow, Countess of Danneskiold-Samsøe, and Countess of Ahlefeldt-Langeland. He was closely related to all important families of the Danish high nobility of the time. The negative side was that his ancestry was rather too much "comital" and too little royal. Instead of including royal princesses and duchesses of small and large German states, as was customary with the Oldenburg royal family, their marriage connections had been mostly with the nobility (chiefly of Denmark). Thus, although they were undoubtedly the senior cadet line of the royal house of Denmark (Oldenburg), the family was regarded as a bit lower than the Ebenbürtige which the rulers of small Germany principalities thought to be the standard. By marriage, however, Frederick Christian drew closer to his cousins, the Danish royal family. In 1786, the twenty-year-old hereditary prince married his distant cousin, the fourteen-year-old Louise Auguste of Denmark and Norway (1771–1843), purported daughter of Christian VII of Denmark by his wife, the late Queen Caroline Mathilde. Louise Auguste's father, the king, was a man with mental disabilities and, throughout his reign, effective control was in the hands of other people (ranging from his step-mother to his wife to his half-brother to various courtiers). The king's mental condition, and his unharmonious relationship with his wife, gave rise to speculation that Louise had been sired by someone other than him, and rumour awarded fatherhood to Johann Friedrich Struensee, the king’s court physician and de facto regent of the country at the time of Louise's birth. Indeed, she was at times referred to as la petite Struensee. The truth of the matter cannot be definitely ascertained. The story of antecedents of the prince's marriage goes as follows: In February 1779, the nation's foremost statesman, Chief Minister Count Andreas Peter Bernstorff, hatched an ingenious