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Before the battle, Osman raids the Byzantines and seizes ammunition, before going to battle with the support of Turkmen and Seljuk forces. During the battle, Dukas and local Tekfurs are killed by Osman's forces, with Nikola and Helen escaping alive, and Turhan Alp being martyred. Meanwhile, Zoe tries to poison the pregnant Malhun Hatun but is caught and arrested. After the battle, Osman's son Orhan is born, whilst Bala reveals to Osman that she is pregnant and Osman decides to establish a state after visiting the Aksakals.

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Osman Bey and his alps escape from the Mongols and plan a counter-raid. News of a raid on Söğüt spreads, causing alarm. Malhun Hatun plans to counter Yakup Bey, who might exploit Osman Bey's absence. Orhan Bey is unhappy seeing Holofira in the market, and Malhun Hatun warns him about trusting Byzantium. Saadet Hatun wants Holofira as her bride and influences Gonca Hatun to tie Alaeddin to Yakup Bey. Tensions rise as Orhan Bey opposes Yakup Bey's control over Yenişehir. Yakup Bey prepares for conquests, placing his son Mehmet Bey in command, which Orhan Bey disapproves of. Danger approaches the cave where Osman Bey and his alps take shelter. Mehmet Bey and Orhan's tension escalates during their conquest, with Mehmet ordering Orhan's assassination, but unexpected events unfold. Osman Bey remains determined to resist threats to his rule, declaring his resolve for freedom.

Osman Bey and Yakup Bey rush to Kestel to rescue their captive children, Orhan and Mehmet. The Tekfur of Kestel demands castles in exchange for their release. Yakup Bey agrees, but Osman Bey opposes, aiming to rescue the children and conquer Kestel. Yakup Bey blames Osman for Mehmet's capture, urging him to find the palace traitor. Alaeddin informs Malhun Hatun that Holofira is the traitor, possibly influenced by Vasilis. Orhan and Mehmet endure torture in Kestel Castle, unaware that Master Gera is behind Tekfur Makranos. Bala Hatun confronts Saadet Hatun, refusing to surrender the castles and imprisoning Saadet and Gonca. Yakup Bey negotiates with the Tekfur, potentially defying Osman Bey's stance. The situation escalates as Osman Bey must decide his next move.

Aygül is currently mentally ill after she learnt the truth about Alişar. Sıddık's betrayal is caught by Sofia and thus he is martyred while Subutay allies with Balgay and Sofia to destroy the Kayı tribe in an attack. Osman, who is aware of the attack, prepares for it and therefore, Subutay's plans backfire.

The tensions escalate further upon the death of Argun, who was killed by Geyhatu, and Geyhatu's visit to Tabriz in order to become the Han of the İlhanlı (transl. Ilkhanate). Nikola vows to ally with the powerful Geyhatu in order to destroy the Turks. Ertuğrul also recovers and stops Savcı from becoming the Bey (which is a part of Dündar's plans) while Yavlak allies with Osman to help him against Geyhatu.

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Osman Bey believes Sultan Mesud's treasure is the key to ending Yakup Bey's dominance. He tasks Orhan Bey with finding the treasure and Alaeddin Bey with monitoring Yakup Bey. Learning of the treasure, Yakup Bey is determined to claim it for power, setting the stage for a race between the two factions. As Orhan searches for the treasure, he crosses paths with Holofira, while Mehmet Bey, under his father's orders, plans to seize it, creating tension between him and Orhan. Meanwhile, Alaeddin's surveillance of Yakup leads to a personal moment with Gonca Hatun, where he questions her feelings for him. Elsewhere, Osman confronts the Sancaksız people for their actions, while tensions rise between Malhun Hatun and Saadet Hatun in the Uc Pazar, where Yakup appoints Cerkutay as patron. Osman and Bala Hatun travel to address unrest, unexpectedly encountering Yakup Bey, who claims the area as Germiyan's property, further escalating their rivalry over power and the treasure.

Osman Bey plans to unite against the Mongols by paying their tax and gathering an army with Yakup Bey. Despite the raid on Yenişehir Palace and the stolen treasury, he remains determined. Tensions rise among the women as Malhun Hatun and Saadet Hatun clash, with Bala Hatun joining in. Saadet Hatun targets Holofira to undermine Orhan, while Bala Hatun worries about her son Alaeddin's involvement with Gonca. Cerkutay visits the injured Boran Bey, hoping to mend relations with Osman Bey and the Alps. Orhan Bey finds the stolen treasure at Bayındır Bey's place, leading to an execution order for Bayındır Bey. Master Gera causes chaos in Söğüt, starting a fire that Alaeddin Bey and Bala Hatun must extinguish. Osman Bey faces unexpected challenges from the Mongol Commander while trying to pay the tax.

Karacelasun seeks revenge and allies with Master Gera to kill Osman Bey's son, Alaeddin. Bala Hatun, learning of Alaeddin's capture, confronts Saadet Hatun at Uç Pazar. Karacelasun encounters Orhan Bey in a fight, but Osman Bey appears, cornering him. Orhan Bey declares his desire to marry Holofira, and Malhun Hatun explains the sacrifices required to be a Bey's lady. Orhan Bey and Alaeddin Bey capture Vasilis, and Yakup Bey reacts to Vasilis' escape from Uç Pazar. Alaeddin Bey faces an attack in his tent, putting his life in danger. The tension between Osman Bey and Yakup Bey continues, with Yakup Bey keeping the Sancaksızlar’s secret. Orhan Bey, seeing Mehmet Bey give Holofira a ring, takes her away on his horse. Osman Bey hosts all the Beys in Yenişehir to address their grievances, closing the gates while they are inside. This move's purpose remains uncertain, as does whether it will clear him of suspicion.

Subutay is beheaded, however, Sofia escapes with the help of Balgay. Kongar becomes a Muslim again after remembering everything but bids farewell to Konur, who was accidentally killed by him when he was drunk with the potion. In an epic showdown, Balgay is supposedly killed by Osman along with the supposed death of Cerkutay by Göktug in the presence of Sofia and her 'dark knights', a special sort of knights, who keep on fighting till they die. However, Cerkutay manages to survive the attack.

The tribe elections are held to decide the new Bey. Dündar comes face-to-face with Osman however, Osman is elected as the new Bey much to Dündar's despair and anger. Meanwhile, a new threat against the Kayı tribe emerges after Petrus, sent by the Pope, arrives to help Nikola kill Osman but also has a secret plan which he doesn't tell Nikola about. Bayhoca, Savcı's son, also returns.

A wedding ceremony is set up in Kayı Tribe for the marriage of Osman Bey and Malhun Hatun. While the wedding is being held, Bala Hatun grieves despite her consent to this marriage. With the arrival of the winter season, after the wedding ceremony, it is decided that Kayı tribe will migrate to Domaniç Plateau. While preparations continue in the tribe, Togay breaks the agreement and decides to attack Osman Bey, despite the warnings of the Mongol governor Yargucu. In the ensuing battle, Togay kills Bamsı Beyrek after a fight.

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Yakup Bey confronts Osman Bey, demanding his allegiance. Cerkutay returns to Yenişehir Palace, creating a festive atmosphere but harbors anger towards Osman Bey. Yakup Bey puts Osman Bey in a difficult position with his Lefke move, but Osman Bey intends to outmaneuver him, knowing Yakup Bey's true intentions. Meanwhile, tension rises between Mehmet and Orhan over Holofira, who wants to return to her homeland but faces opposition from Orhan. Gonca seeks a treasure map from Alaeddin Bey, leading to their confrontation at the caravanserai. Alaeddin reunites with his mother, Bala Hatun, who informs him of Yakup Bey's demand for allegiance from Osman Bey. Saadet Hatun arrives in Uç Pazar and reacts strongly upon learning of the assassination attempt on her husband, Yakup Bey. Osman Bey plans to host all the beys and Yakup Bey in his palace, but the real outcome of their tension is yet to unfold.

Yakup Bey conquered Lefke Castle before Osman Bey and claimed to give it to him, but Osman Bey suspects Yakup Bey's intentions. A new enemy, Master Gera, arrives at the Edges. Disguised as a merchant, he meets Osman Bey, who invites him to Yenişehir. Master Gera's arrival brings chaos, and he plans to kill Boran Bey, Osman's trusted man. Malhun Hatun, aware of Saadet Hatun's grudge, plans a significant move against her. Meanwhile, Orhan Bey, disguised as a Mongol, takes a treasure and shoots Mehmet Bey, leaving his fate uncertain. Finally, Yakup Bey confronts Osman Bey, asking for allegiance one last time, and Osman Bey must decide his response.

Karacelasun seeks vengeance for his brother and meets Master Gera, considering an alliance. Orhan Bey and Holofira's love grows, but Malhun Hatun upsets Holofira. Alaeddin Bey and Gonca Hatun clash, and Karacelasun raids the Uch Bazaar, angering Mehmet Bey who blames Osman Bey. Osman Bey, aware of danger, remains steadfast. Yakup Bey and the Turkmen Beys meet, refusing to let the Mongols or Byzantines prevail. Osman Bey knows the Mongols and Turkmen Beys are after him and Yakup Bey. Yakup Bey’s life is in danger. Osman Bey and his alps face traps trying to save Yakup Bey from Karacelasun's ambush. The outcome remains uncertain.

Osman Bey hints at knowing Yakup Bey's schemes, planning to reveal them while hosting the beys. Orhan Bey takes Holofira, causing tension with Mehmet and confrontations with Saadet and Malhun Hatun. Alaeddin confesses his love to Gonca, seeking Bala Hatun’s advice. Yakup Bey plans to exchange Vasilis for gold with the Crusaders, influenced by Master Gera. Malhun Hatun insists Holofira must become a Muslim to marry Orhan, which she refuses. Karacelasun clashes with Mehmet, Orhan, and Alaeddin during the Vasilis exchange, winning the fight. Osman Bey blames Yakup Bey and plans to save his children from Karacelasun.

Osman Bey takes action to catch Constantine off guard, ultimately confronting him. The end prepared for Constantine is significant. Mehmet Bey's involvement in the plot against Elçim Hatun leads to a showdown with Alaeddin. This marks a critical impasse for the two principalities. Orhan Bey, concerned for Holofira's safety in Bursa, seeks to take her away. Her response to Orhan's request is pivotal. Following Osman Bey's victory over Constantine, Alaeddin and Gonca's wedding takes place amidst celebrations, and Osman sends letters to all principalities. Osman Bey aims to unite all Turks under one flag, inviting the principalities to join him in establishing a state. The response of these principalities will shape the future of their unified cause.

Tekfur Alexis of İnegöl seeks revenge on the Kayı tribe for conquering Kulucahisar. He invades a caravan of the Kayı tribe, Osman, takes his revenge by defeating him in a battle. After the battle, the Emperor, concerned over the Turk threat on his empire, sends Aya Nikola to İnegöl Castle. Nikola kills Alexis for his failure and snatches the castle from him. Nikola also frees an old friend from prison, Flatyos. Ertuğrul also later returns towards the end after a year in Konya.