Plot
In the year 317 of the Pars calendar, the western kingdom of Lusitania, a monotheistic realm, invades the eastern kingdom of Maryam to impose worship of its sole god, Yaldabaoth. Andragoras III, the warrior king of Pars, leads his army to crush the Lusitanian invaders. He is married to Queen Tahamenay, celebrated as the most beautiful woman in the kingdom, and they have a son, the eleven-year-old Prince Arslan, who is often ignored by his parents. In the year 320, Lusitania, having completed its conquest of Maryam, launches an assault on Pars. King Andragoras III leads his vast army to meet the threat at Atropatene, accompanied by his finest generals, including Kharlan and Daryun, as well as the now fourteen-year-old Prince Arslan. However, a trap set by the traitorous General Kharlan and a mysterious Lusitanian general known only as the Silver Mask causes the defeat of the Parsian army.
King Andragoras is captured by the Silver Mask. Prince Arslan, whom Kharlan attempts to kill personally, is rescued by Daryun. The two flee to seek out Daryun's friend, the former lord Narsus. Joined by Narsus, his servant Elam, and other companions, the small group embarks on a quest to reorganize the Parsian resistance and liberate the kingdom, even after the capital of Ecbatana falls to the Lusitanians. Guided by his new allies, Arslan must mature and broaden his understanding of the world in order to free his country from the invaders and the Silver Mask, Hilmes, who is Arslan's cousin and the son of Osroes. Arslan leads the invasion of Pars to reclaim the throne, as he believes his father was murdered by his younger brother Andragoras. During an encounter with Hilmes, Arslan learns from Narsus that he is not the legitimate heir of King Andragoras but nevertheless decides to protect Peshawar Citadel, a fortress located in Pars. The Keep of Saint Emmanuel is captured by the Parsian army. At Arslan's command, the Lusitanian survivors, including Etoile, are taken with them as they march toward Ecbatana.
After escaping his prison, King Andragoras arrives at Peshawar and assumes command of the army. Arslan is commanded to leave Peshawar without his allies and not return until he has gathered an army of fifty thousand soldiers, a seemingly impossible task tantamount to exile. Disgusted by the unjust royal mandate, Arslan's friends and advisors defy Andragoras in order to accompany the prince. After obtaining a large number of warriors, Arslan returns to Peshawar and learns from the queen that he is an adopted child and is not accepted as the heir. Nonetheless, Arslan declares he will still fight to become king, even if it means confronting his father.
During the battles between Arslan's forces and the king's, the queen appears and murders her husband. Unwilling to let either Arslan or Hilmes rule Pars, Arslan's teacher Vahriz uses dark magic to raise the dead to kill his enemies. This leads him to aim to use the mythical Snake King Zahhak as the new ruler of Pars by having him possess Andragoras's body, which is first used to kill the queen. After Daryun kills Vahriz, Arslan's and Hilmes's forces confront Zahhak.