Board Thread:General Discussion/@comment-25926288-20150618155459/@comment-26237024-20150714152036

Regina did. Jefferson's ability to remember his identity was one of her own contributions to the curse - along with some of her objects, the hearts she had collected over the years, Daniel's coffin and the trigger she had created from the curse.

Just as Emma's role as "the Savior" was one of Rumpelstiltskin's contributions to the curse, and the Storybrooke citizens' year-long memory loss was Zelena's contribution.