"The Two Kings' Children" is a German fairy tale collected by the Brothers Grimm in Grimm's Fairy Tales, tale number 113.
It is Aarne-Thompson type 313C, the girl helps the hero flee, and type 884, the forgotten fiancée. Others of the first type include "The Master Maid", "The Water Nixie", "Nix Nought Nothing", "Jean, the Soldier, and Eulalie, the Devil's Daughter", and "Foundling-Bird". Others of the second type include "The Twelve Huntsmen", "The True Bride", and "Sweetheart Roland".
The Brothers Grimm also noted that the scene with the false bride resembles that of "The Singing, Soaring Lark". Other fairy tales that use a similar motif include "East of the Sun and West of the Moon", "Black Bull of Norroway", "The Feather of Finist the Falcon", "Mr Simigdáli", and "White-Bear-King-Valemon".
Once long ago, it was foretold that a king's son would be killed by a stag at the age of sixteen.
When the prince was sixteen, he went hunting and chased a stag; a great man, a king, caught him and carried him off. The king set him to watch his three daughters; one each night. The king told the boy that he would call on the prince each hour and if he answered every time, he could marry his daughter, but if not, he would be killed. Each daughter enchanted a statue of St. Christopher to answer in the prince's place, thus saving the prince from death.