Board Thread:Character Discussion/@comment-29195016-20160805003445/@comment-25896389-20170529013635

yeah, a book revealed there were four Wicked Witches originally until Glinda and the Witch of the North rose up and defeated two of them. Dialogue in Once  seems to suggest the reverse happened in the show: Once Zelena took out the Sisterhood, Wicked witches came out of the woodwork.