During the Principate, Marsyas became a subversive symbol in opposition to Augustus, whose propaganda systematically associated him with the silens’ torturer Apollo. Augustus's daughter Julia held nocturnal assemblies at the statue, and crowned it to defy her father. The poet Ovid, who was ultimately exiled by Augustus, twice tells the story of Marsyas's flaying by Apollo, in his epic "Metamorphoses" and in the "Fasti", the calendrical poem left unfinished at his death. Although the immediate cause of Ovid's exile remains one of literary history's great mysteries, Ovid himself says that a "poem and transgression" were contributing factors; his poetry tests the boundaries of permissible free speech during Rome's transition from republic to imperial monarchy.