Heracles captured her and demanded Hippolyte 's girdle in exchange for her freedom .
Melanippe , an Amazon , sister of Hippolyta , Penthesilea and Antiope , daughter of Ares .
Heracles captured sister and demanded Hippolyta 's girdle in exchange for sister 's freedom .
Melanippe , an Amazon , sister of Hippolyta , Penthesilea and Antiope , daughter of Ares .