Salome was a follower of Jesus who appears briefly in the canonical gospels and in apocryphal writings. She is named by Mark as present at the crucifixion and as one of the women who found Jesus's tomb empty. The interpretation has further identified her with other women who are mentioned but not named in the canonical gospels. In particular, she is often identified as the wife of Zebedee, the mother of James and John, two of the Twelve apostles. In medieval tradition Salome (as Mary Salome) was counted as one of the Three Marys who were daughters of Saint Anne, so making her the sister or half-sister of Mary, mother of Jesus.

Salome is the first, after the midwife, to bear witness to the Miraculous Birth and to recognize Jesus as the Christ, are circumstances that tend to connect her with Salome the disciple. By the High Middle Ages, this Salome was often (but not always) identified with Mary Salome in the West and therefore regarded as the believing midwife.

More Info: en.wikipedia.org