User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-24277053-20151207133910

Anna is an ancestor of someone we know, either Layla and Lucy, or Hisui, that would be my best guesses. I don't think she is Sorano / Yukino's ancestor, those sisters have enough shocking revelation, that there is no room for that. If she is Lucy's ancestor, she is not a Heartfilla, like some people are saying, she would come from Lucy's mother's side of the family thus have a different last name.