The title Heridtary Prince was used a few times in earlier history
The first was for His Royal Highness the Hereditary Prince Frederik (1753-1805), the younger son of Frederik V of Denmark-Norway and his second wife, Juliane Marie, who was the heir 1766-68 for his half brother Christian 7. But he used the title till his death. His oldest son became King Christian 8. and the younger, Ferdinand was known as Hereditary Prince and was married to his cousin, Caroline af Danmark - daughter of King Frederik. But it was his sister, Princess Charlotte of Denmark's daughter Princess Loiuise of Hessen-Kassel's husband; Christian of Glücksburg, who inherited the throne in 1863 (After Charlotte and her children transferred their rights to him). Christian himself had hereditary heriditary rights as a decendant of an early Oldenborg King, but he had 3 older brothers.
His two oldest brother's Carl and Frederik sided with the Schleswig-Holsteins in the 1848-war against Denmark.
The oldste brother, Carl, was married to Frederik 6's youngest daughter, Wilhelmine. Frederik had several children and the third brother, Vilhelm was unmarried.
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