lysis56 wrote: why Alexander may not, if in fact, Herakles was his child failed to recognize him, if in fact he did.
Scott's reply says all that needs to be said regarding why Nearchus supported Herakles' claim, I think!
As to why Alexander didn't "recognise" Heracles ... well, there's nothing to say that he didn't recognise him as his son.
Recognising him as his heir is something different, however. For a start, we have no evidence to suggest that Alexander actually married Barsine, and in fact the historical record implies that he didn't. So, for a start, Heracles was illegitimate.
Even if this didn't provide a bar to Heracles becoming Alexander's heir, as soon as Roxane became pregnant he had the prospect of a legitimate son (assuming it was a son) to succeed him. Whether this made a difference or not, we cannot tell. Illegitimate or not, it could be argued that Heracles had a better imperial pedigree than Roxane's child would have, which might have made him a better prospect as heir. On the other hand, what was the *Persian* (let alone the Macedonian) view of illegitimacy? If Alexander wished to provide a successor who would be acceptable to the non-Macedonians/Greeks in his empire, then a legitimate Sogdian prince might have been far more acceptable than an illegitimate Persian one.
All would have been thrown out of the window if Stateira had also borne Alexander a son; and there is a suggestion that she, too, was pregnant in 323BC. As the daughter of Darius, any child she had would have leaped straight to the top of the list of acceptable heirs. That certainly caused Roxane some alarm, for the first thing she did after Alexander's death was to get rid of Stateira.
However, and this is the main thing, the point is that Alexander nominated NO-ONE to succeed him. He had one child who was half-Persian, but who was probably illegitimite; he had a half-Sogdian baby (sex undetermined) on the way; and he possibly had a half-Persian baby (sex undetermined) on the way. Had he lived, he could have nominated any of them as his successor, but one needs to wonder which would have been the most acceptable to the Persians. If Roxane and Stateira had both delivered girls, Heracles might have been the best, or only choice; if either of the others produced a boy, I suspect Alexander would have chosen him (or one of them).
It could also be argued that Alexander was well aware that Heracles was, until 323BC, his *only* option, and that might explain why Heracles was brought up well away from the army and the jostling generals. It helped to protect Heracles until he might be needed to take a more prominent role.
ATB