The Tale of Tsar Saltan
The motif of a woman's babies, born with wonderful attributes after she claimed she could bear such children, but stolen from her, is a common fairy tale motif; see "The Dancing Water, the Singing Apple, and the Speaking Bird", "The Tale of Tsar Saltan", "The Three Little Birds", "The Wicked Sisters", "Ancilotto, King of Provino", and "Princess Belle-Etoile". Some of these variants feature an evil stepmother.