Heliodorus has been edited twice in the last thirty years, by Colonna and by Rattenbury and Lumb . Colonna's text is erratic, but in another respect his work on Heliodorus has been productive: he has put it beyond doubt that Book 9 of Aethiopica was written after the third siege of Nisibis, which took place in A.D. 350 . There is no point in repeating Colonna's arguments here; they merit mention because no one has taken any notice of them.