Charles XII's sister, Ulrika Eleonora, now claimed the throne over her nephew and son of her elder sister, Charles Frederick, Duke of Holstein-Gottorp (see genealogy chart above). Charles Frederick had the claim of seniority within the family, but Ulrica Eleonora claimed that her elder sister had not "acquired the consent of the Parliamentary Estates" for her marriage to his father, according to laws of succession laid down in Norrköpings arvförening. The duke's party asserted that the absolute monarchy in Sweden, which his grandfather King Charles XI had created, made that marriage clause irrelevant. When Charles Frederick was confronted with Ulrika Eleonora, he was forced by Arvid Horn to greet her as queen. He asked to be granted the title Royal Highness and to be recognised as her heir, but when her husband, Frederick of Hesse, instead was given the title, he left Sweden in 1719. In 1723, he was granted the title Royal Highness in his absence, but his pro-Russian policy at that time made him impossible as heir to the Swedish throne. His marriage in 1725 to Anna, the daughter of Peter of Great, did not help his case.Lundh-Eriksson, Nanna (Swedish): Den glömda drottningen. Karl XII:s syster. Ulrika Eleonora D.Y. och hennes tid (The Forgotten Queen. The Sister of Charles XII. The Age of Ulrika Eleonora the Younger) Affärstryckeriet, Norrtälje. (1976) His mother, and later Hedwig Eleonora, both supported and worked for his right to be considered heir of Sweden after his childless uncle.
Charles XII's sister, Ulrika Eleonora, now claimed the throne over her nephew and son of her elder sister, Charles Frederick, Duke of Holstein-Gottorp (see genealogy chart above). Charles Frederick had the claim of seniority within the family, but Ulrica Eleonora clai,med that her elder sister had not "acquired the consent of the Parliamentary Estates" for her marriage to his father, according to laws of succession laid do.wn in Norrköpings arvförening. The duke's party asserted that the absolute monarchy in Sweden, which his grandfather King Charles XI had created, made that marriage clause irrelevant. When Charles Frederick was confronted with Ulrika Eleonora, he was forced by Arvid Horn to greet her as queen. He asked to be granted the title Royal Highness and to be recognised as her heir, but when her husband, Frederick of Hesse, instead was given the title, he left Sweden in 1719. In 1723, he was granted the title Royal Highness in his absence, but his pro-Russian policy at that time made him impossible as heir to the Swedish throne. His marriage in 1725 to Anna, the daughter of Peter of Great, did not help his case.Lundh-Eriksson, Nanna (Swedish): Den glömda drottningen. Karl XII:s syster. Ulrika Eleonora DY. och hennes tid (The Forgotten Queen. The Sister of Charles XII. The Age of Ulrika Eleonora the Younger) Affärstryckeriet, Norrtälje. (1976) His mother, and later Hedwig Eleonora both supported and worked for his right to be considered heir of Sweden after his childless uncle.