Nobody whose descriptions of Helen (nominally of Troy) have survived the ages ever met her; she's a legendary figure from a mythological past. Accounts (text, sculpture, image) tell us more about the proclivities of those who gave them than of the woman herself.

#HelenOfTroy

Oh, and I won't be watching; I had enough of US crapping on European culture with the Pitt Troy film.
Lastly, complaints of casting are nothing but racist.