Comment: The keyword is a cast of the "Fairy Hill".

Agnete is Caren's daughter. She is truly Elisabeth.

Caren is a farmer. She believes the fairy tale. She brings the abandoned girl up as Fairy King's princess.

Elisabeth was a daughter of Jens Munk (1579-1628)'s who was a explorer and also a foster one of Warkendorf who had been the lord. Christian 4th was her representative father. Actually she was Warkendorf's niece.

Christian 8th (1786-1848) was the King of Denmark and called as the last King of absolute autocracy. He was the King of Kuhlau's period in Denmark (After the Frederik 6th's death /1839~1848). Kuhlau had played in front of him. Kuhlau had lost his house by fire in 1831 but rejected his support.

Christian 4th is an important cast in the "Fairy Hill" and the historically true King of Denmark.

Margarete is the name of the present Queen of Denmark and the second queen in the
Danish Royal Family. If you click her on the basis of sexual difference, you seem to be correct. But in this question we think "Fairy Hill" is the keyword.