Cleitus is a seasoned Macedonian military officer who serves as a trusted confidant to the central protagonist. Respected for his extensive experience, he previously fought under the protagonist’s father, Philip II, which establishes his deep roots in the old Macedonian order. His personality is defined by unflinching honesty, unwavering loyalty to Macedonian traditions, and a firm belief in the military principles of Philip’s era. He is portrayed as a protector of the protagonist’s legacy and a moral challenger who is not afraid to voice his dissent when he perceives a betrayal of their heritage.

Cleitus’ primary motivation is his unshakeable dedication to the Macedonian legacy he helped build. This driving force brings him into direct conflict with the protagonist’s later policies, which favor the adoption of Persian customs and the integration of Persian soldiers into the ranks. Cleitus views these reforms not as progress, but as cultural decay and a rejection of Philip II’s memory. His role in the story is that of a traditionalist foil to the protagonist’s increasingly autocratic and cosmopolitan vision. The relationship between Cleitus and the protagonist is profound and long-standing, forged on the battlefield, including an instance where Cleitus saves the protagonist from certain death in a crucial battle. This bond is further strengthened by a personal connection, as Cleitus’ sister served as the protagonist’s nurse in childhood.

The development of their relationship follows a tragic arc of growing tension that culminates in a violent and pivotal confrontation. During a heated banquet in Bactria, Cleitus, inflamed by alcohol and rage, publicly denounces the protagonist. He disputes the protagonist’s claims to divine lineage, scorns his marriage to a foreign woman, and issues a direct challenge to his leadership and moral integrity. In a fit of impulsive fury provoked by Cleitus’ insults, the protagonist kills him with a spear. This act becomes a decisive turning point, revealing the protagonist’s volatile temperament and casting Cleitus as a martyred figure of internal resistance. The protagonist later expresses deep regret for the deed, acknowledging the irreparable breach caused by Cleitus’ death. In terms of notable abilities, Cleitus is a highly capable commander who holds the prestigious rank of leading the elite Companion Cavalry.