Leonora Christina, Countess Ulfeldt, born "Countess Leonora Christina Christiansdatter" til Slesvig og Holsten (8 July 1621 – 16 March 1698), was the daughter of King Christian IV of Denmark and wife of Steward of the Realm, traitor Count Corfitz Ulfeldt. Renowned in Denmark since the 19th century for her posthumously published autobiography, Jammers Minde, written secretly during two decades of solitary confinement in a royal dungeon, her intimate version of the major events she witnessed in Europe's history, interwoven with ruminations on her woes as a political prisoner, still commands popular interest, scholarly respect, and has virtually become the stuff of legend as retold and enlivened in Danish literature and art.
Christian IV is believed to have fathered fifteen children by his second wife, Kirsten Munk, at least three of whom were born before the couple married in 1615, and eight of whom lived to adulthood. The Munks were noble courtiers, and Kirsten's formidable mother, née Ellen Marsvin, obtained the King's signed promise to marry the girl before yielding her to the King's passion. The marriage was morganatic and Leonora Christina was not a princess, sharing rather the title of Countess af Schleswig-Holstein bestowed upon her mother in 1629 (distinct from the title borne by the Dukes of Schleswig-Holstein, dynastic kinsmen of the Danish kings who possessed actual domains in the Schleswig and Holstein provinces, some of whom also exercised sovereignty there). Nonetheless, she grew up with her parents in Copenhagen's royal palace (across the courtyard from the tower where she would eventually be imprisoned) on familiar terms with her three elder half-brothers — including the future King Frederick III — sons of the late Queen Anne Catherine of Brandenburg. The King accused his wife of betraying him with another man and divorced her in 1630, having already taken a mistress, Vibeke Kruse, his wife's servant. Although she proceeded to bear the King a new brood of children who would become the bitter rivals of Kirsten Munk's children, Leonora Christina seems to have retained her father's favor.