Heliodorus has been edited twice in the last thirty years, by Colonna (Rome, 1938) and by Rattenbury and Lumb (Budé; vol. i, 1935; vol. ii, 1938; vol. iii, 1943).
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 (Athetueum, 1950, 79–87). There is no point in repeating Colonna's arguments here; they merit mention because no one has taken any notice of them.