Originally Posted by
Manuel I Komnenos
Philotas was proven guilty and we've got to understand how the Macedonian justice system worked. One person, usually the King, would act as the prosecutor and the Macedonian Council, made up of the most prominent Hetairoi would either adopt these accusations or drop them. In a similar case, Perdiccas, the supervisor of Alexander's heirs (Phillip and Alexander IV) accused Ptolemy of exceeding his authority in the satrapy of Egypt. Ptolemy was called in the Macedonian Council, Perdiccas acted as the prosecutor but the accusations were dropped by the other Hetairoi. In our case, Philotas was named as one of the conspirators and was thus judged by the Macedonian Council which pledged him guilty. Of course, there was another Macedonian Law, or to say it better, tradition, that if a man was pledged guilty of conspiracy, all his family (wife, parents, children, brothers, sisters) were to be put to death as well. Besides that, Parmenio had begun amassing way too much power in his hands, so, by removing also him in the process, Alexander was freed from another burden. After all, since his son was murdered, it would have been absurd to let the father live and hate Alexander for the rest of his life.
Due to the fact that Cassander grew to hate Alexander after his visit in the East, (contrary to what the Alexander movie depicts, Cassander stayed in Macedon throughout the campaign), Alexander grew uncomfortable with his family and asked Antipater to come in Babylon. Before his arrival, Alexander died. It has been speculated that Antipater and his family were also to be murdered.
All in all, nobody can say that Alexander acted beyond his power. Alexander enacted the process which had been used before and continued to be used after him. Philotas was tried and convicted according to the standard Macedonian procedures. As for Cleitus the Black murder, it was of course a tragic event, which Alexander regretted until his death.