The tale is classified in the Aarne-Thompson-Uther Index as tale type ATU 870, "The Princess Confined in the Mound".
ðə tˈeɪl ɪz klˈæsᵻfˌaɪd ɪnðɪ ˈɑːɹntˈɑːmpsənˈʌðɚɹ ˈɪndɛks æz tˈeɪl tˈaɪp ˌeɪtˌiːjˈuː ˈeɪthˈʌndɹɪd sˈɛvənti, "ðə pɹˈɪnsɛs kənfˈaɪnd ɪnðə mˈaʊnd".