When Caliph al-Mahdi dies, the caliphate is taken over by Musa, to whom people pledge allegiance as caliph, and to Harun al-Rashid as the crown prince. Musa accuses Yahya of plotting against him.
Harun finds out that the reason for Yahya's imprisonment was his knowledge of Musa's plan to remove Harun as the crown prince and appoint his son in his place. Yahya escapes from prison, while Harun and Ja’far leave Baghdad.
Musa seizes control of the slave girls' markets, orders to cut off the hands of the beggars, and removes Judge Abu Yusuf from office because of his objection to his decrees, while Harun decides to return to Baghdad to confront Musa.
Muhammad bin Suleiman besieges Medina. Musa rescinds his decision to dismiss Abu Yusuf. Harun helps Ja’far flee before Musa's men capture him.
Hamdan steals a ring from Asim, and while selling it, he is arrested for theft. Asim goes to release him and absolve him of the theft charge. Musa limits Harun's powers.
Harun proposes to Asma, and she agrees. Meanwhile, Umm al-Fadl (al-Fadl’s mother) prepares to incite Muslims against Musa in the event that he chooses his son to be the crown prince instead of Harun.
Hamdan is released and absolved of theft charge, whereupon news of Asma and Harun's marriage shocks him, so he begins searching for her.
Hamdan swears to kill Harun after taking Asma away from him. Caliph Musa summons Harun to Baghdad to fight against the Romans.
As Harun returns home after the caliph summons him to fight, Zubaidah promises to bear him a son, but fails to convince him to leave Asma. Musa orders Harun to bring him the heads of their brothers Muhammad, Fadl and Ja’far.
Hamdan searches for Harun and Asma to take revenge on them, while Asma gives birth to her first child with Harun.
Hamdan receives news of Asma's giving birth. Al-Fadl tries to warn Ja’far and Muhammad that they need to face Harun, upon discovering the caliph's orders to kill them. As Asim's house is attacked, he gets killed.
Harun's men hide from him news of what happened in Asim's house. Meanwhile, Asma disappears, and Hamdan continues to look for her and refuses to believe the news of her death. Harun is shocked, as he receives news of the death of Asma and her father.
Asma is held captive by Empress Irene, while Hamdan finds Asma’s son with Umm Jaber, to whom he introduces himself as the child's father.
Hamdan, with his men, launches an attack on the place where Asma's held captive, and succeeds in liberating her before escaping, after which Hamdan lets Asma choose between staying with him or returning to Harun, so she decides to stay with him.
Musa chides Harun for leaving Asma unprotected, while Harun receives news of his wife Zubaidah’s pregnancy.
As Harun receives news that Asma is not dead, he orders his men to search for her, while Musa tries to arrange for his son to be installed as the crown prince after Harun.
As Musa is killed by a poisoned drink, Harun takes over the caliphate, so Hamdan asks Asma to go to Baghdad to claim her son’s right from Harun.
All factions pledge allegiance to Harun as the caliph of Muslims, succeeding Musa. Asma and Hamdan takes a shelter in the house of Rabiʿa al-ʿAdawiyya.
Asma and the child disappear, and Hamdan kills Salam while searching for them. Harun encourages Muslims to study religion, jurisprudence and science in exchange for a lot of money from the treasury.
As Zubaidah gives birth to her first child with Harun, he names him Muhammad al-Amin. Scholars and writers seek Caliph Harun to sponsor them.
Harun receives a poem from an unknown person insinuating Ja’far's plot to kill him, whereas he chooses Muhammad al-Amin as his successor instead of Ibrahim al-Ma’mun.
Years later, Asma and Hamdan meet again, and Harun’s son, Ahmed, becomes a young man, while Asma tries to hide from him the identity of his father. Harun installs al-Amin as the crown prince, and then al-Ma’mun. Harun meets Ahmed without knowing their kinship.
Harun orders his men to search for Ahmed, whose family lineage he starts to question. Masroor warns Harun that Yahya's plotting against him.
Hamdan tells Dawud the truth about Harun's eldest son, Ahmed, who asks for their help. Harun goes out in disguise to check on people's conditions himself.
Harun asks Ja’far to release the poet al-Atahiya, after which he receives a message from Egypt stating the governor's plan to overthrow the caliphate, whereupon he summons him.
Abu Isma’il warns Harun not to leave the affairs of the Islamic state to his men. Harun orders that 250 thousand soldiers be sent to face the Romans, while hatching a plot to entrap the traitors in his council.
The Umayyads in Persia call for the return of the Umayyad Caliphate. Abu al-Fadl's men are kidnapped in Khorasan. When Ja’far evades fighting with Harun's army, the latter orders Masroor to behead him in case he doesn’t comply with the command.
As the caliph falls ill, the Islamic state is shaken, thinking his death is imminent, and after his condition improves, he discovers a plot that has been hatched against him in his absence.
Harun puts his sons in charge of the eastern and western countries. When al-Fadl arrives with his army to the caliph's palace, Harun accuses him of plotting against him during his illness, and orders the imprisonment of al-Fadl and the arrest of Wadah.
Phinehas hatches a new plot to get rid of the caliph, upon discovering the lineage of Asma’s son to Harun, who pardons al-Fadl.
Zubaidah reproaches Harun for constantly pardoning Yahya's sons. Asma avoids seeing Zubaidah while visiting Umm al-Fadl so that she doesn’t know that she’s alive.
Ahmed fails to force Asma to tell him his father's identity. When Ja’far asks Harun to agree to his marriage to Abbasa, he refuses.
Abu Jaber accuses Hamdan and his wife of colluding against Harun, who leads an army and sets out to fight Nikephoros at the Fort of the Willow (Hisn al-Safsaf).
Harun and his army storm the Fort of the Willow, inflicting a crushing defeat on the army of Irene and Nikephoros. Yahya tells Ja’far that Ishaq might marry Abbasa.
Harun celebrates his first victory over the Empress. Ja’far refuses to acknowledge his daughter. Hamdan and Asma flee to Umm Jaber's house.
Harun transfers the caliphal seals again from Ja’far’s possession to al-Fadl’s. As Ja’far asks Harun to respond to his request to marry Abbasa, he tells him that she doesn’t want to, whereupon Masroor kills Ja’far at Harun's behest.
Ahmad, Harun’s son, divorces his wife after she scoffed at him for not knowing his father. Following the overthrow of Irene, Nikephoros ascends the Roman throne, whereupon he declares war on Harun, who sends his army to fight him.
As Harun finds his mother's necklace, which was in Asma's possession, his hopes of finding her are renewed, and when he reaches her, he asks her to forgive him.
Asma returns with Harun to his palace, where he remarries her, while Ahmed avoids going to the palace and meeting his father. Hamdan is shocked after Asma returns to Harun, so he decides to take revenge.
When Rafi ibn al-Layth rises up in Samarkand against Harun, seeking to depose him from the caliphate, Harun sets out at the head of the army to put down the rebellion.
Harun falls ill and his condition deteriorates before confronting Rafi. He meets his son Ahmed for the first time and asks him to take over the caliphate after him, but he rejects sovereignty and power. When Harun dies, Muhammad al-Amin succeeds him as the sixth Abbasid caliph.