Vanya and the Green Knight
Ancient Vampire, Once-Steward of the Crimson Castle
“You may have heard me as the Prince with the Red Corsage. I once attended a party in severskii”
In this tale, years before the baba knyagina, everyone is dead in the morning but the one prince, who happened to have a token from his lady lover that protected him, and so the royal line could continue. Walking out of the palace in the morning to tell the town he was knyaz
The Prince with the Red Corsage would have been the guest that some baba warned the knyagina and knyaz against, and then a swan, and then a ranger. Three warnings.