Philotas

Philotas (in Greek, Φιλώτας, died October 330 BC) was the eldest son of Parmenion, Alexander's most experienced and talented general. When Alexander became king of Macedonia (336 BC) with Parmenion's support (Parmenion had executed Attalus, accused of plotting with the Athenians against Alexander, and suggested by a very few modern historians as the head of a noble faction opposing Alexander's accession. There is very little source evidence for this, however), Parmenion and his relations were rewarded with offices and commissions. Philotas was promoted, from a commander of a cavalry squadron to commander of the Companions, the corps of Macedonian cavalry that also provided bodyguards and attendants to the King. (In battle, Alexander rode with and led this cavalry corps; they were, literally, his "companions," therefore the name.) Philotas, though a highly capable officer, was widely perceived as arrogant and pompous; he was never able to master the role of courtier, was often a center of conflict, and often earned the King's disfavour.

In the latter part of 330 BC, Philotas was accused of conspiring against Alexander. He had been subject to similar reports previously, though the case against him in 330 was more serious; his accusers included the commander Coenus, who was married to Philotas' sister. Philotas was tried and convicted, tortured to reveal the extent of the conspiracy, then stoned or speared to death with other convicted plotters. The execution of Philotas necessitated the removal of Parmenion, who, while innocent of any plotting, was judged unreliable once his son and heir had been put to death. Alexander sent assassins to kill Parmenion before the news of his son's execution reached him.

Read more about Philotas:  In Literature