Abstract
In the preface to the Anabasis Arrian explains his reliance on Aristobulus because he took part in Alexander's campaigns and yet wrote after Alexander's death, when he was under no constraint or hope of gain that might lead him to distort the truth. It is in fact clear from 7. 18. 5 that Aristobulus was still writing his history after the battle of Ipsus in 301. According to Ps.-Lucian, Macrobioi 22, he stated at the beginning of his work that he was already in his eighty-fourth year; since numbers are easily subject to copying errors, it may be that the author of the Macrobioi was himself deceived by a manuscript corruption, and in any case, as the date of Aristobulus' birth is unknown, this testimony casts little light on the date of the history.