 Several alternate versions appeared in the "Bibliotheca", the "Fabulae" of Hyginus, and the "Metamorphoses" of Antoninus Liberalis, with major variations depicting Myrrha's father as the Assyrian king Theias or depicting Aphrodite as having engineered the tragic liaison.Critical interpretation of the myth has considered Myrrha's refusal of conventional sexual relations to have provoked her incest, with the ensuing transformation to tree as a silencing punishment.It has been suggested that the taboo of incest marks the difference between culture and nature and that Ovid's version of Myrrha showed this.