A second mention of the term is made in The Tale of Igor's Campaign when Igor is captured by the Polovtsi; this event is recorded as a riddle: "And here Prince Igor exchanged his golden saddle of a prince for the saddle of a Koshey (slave)." Nikolai Novikov also suggested the etymological origin of koshchii meaning "youth" or "boy" or "captive", "slave", or "servant". The interpretation of "captive" is interesting because Koschei appears initially as a captive in some tales. In folk tales Koschei is a common antihero in east-Slavic folk tales. Often tales involving him are of the type AT 302 "The Giant Without A Heart" (see Aarne–Thompson classification systems); and he also appears in tales resembling type AT 313 "The Magic Flight". He usually functions as the antagonist or rival to a hero. Love rivalry and related themes are common. The typical feature of tales concerning Koschei is his protection against being killed (AT 302) – to do so he has hidden his soul inside an egg, and further nested the egg inside various animals, and then in protective containers and places. In other tales, Koschei can cast a sleep spell that can be broken by playing an enchanted gusli. Depending on the tale he has different characteristics: he may ride a three- or seven-legged horse; may have tusks or fangs; and may possess a variety of different magic objects (like cloaks and rings) that a hero is sent to obtain; or he may have other magic powers. In one tale he has eyelids so heavy he requires servants to lift them (cf. the Celtic Balor or Ysbaddaden, or Serbian Vy). Psychologically, Koschei can represent an initially benevolent, but later malevolent, father (to a bride) figure. The parallel female figure, Baba Yaga, as a rule does not appear in the same tale with Koschei, though exceptions exists where both appear together as a married couple, or as siblings. Sometimes, Baba Yaga, as an old woman figure appears in tales along with Koschei as his mother or aunt. "Marya Morevna" In a tale also known as "The Death of Koschei the Deathless", Ivan Tsarevitch encounters Koschei chained in his wife's (Marya Morevna's) dungeon. He releases and revives Koschei, but Koschei abducts Marya. Ivan goes to rescue Marya several times, but Koschei's swift horse allows him to easily catch up with the escaping lovers; each time the magical horse informs