Appian of Alexandria Civil Wars 5.14.144

[144] Titius brought Pompeius’ soldiers into Antony’s service and put Pompeius himself to death at Miletus in the fortieth year of his age. This he did either on his own account, angry at some former insult, and ungrateful for the subsequent kindness, or in pursuance of Antony’s order. Some say that Plancus, not Antony, gave this order. They think that Plancus, while governing Syria, was authorized by letters to sign Antony’s name in cases of urgency and to use his seal. Others think that it was written by Plancus with Antony’s knowledge, but that the latter was ashamed to write it on account of the name Pompeius, and because Cleopatra was favorable to him on account of Pompey the Great. Still others think that Plancus, being cognizant of these facts, took it upon himself to give the order as a matter of precaution, lest Pompeius, with the coöperation of Cleopatra, should breed dissension between Antony and Octavius. ¹