Kuruluş Osman

Osman began his journey by forming a friendship with Yorgopolos and the Kayi tribe expanded its influence further during the reign of Osman Ghazi, but some problems will hinder Osman and he must solve it.

The appearance of Adbali and his daughter, Bamsi bid farewell to his son Ibars, while sedition began to appear in the horizon between the Kayi tribe and the castle after the killing of Yorgopolos and Sofia accused Osman of killing him.

Seeing Helen and Sofia running down the aisle, Kalanoz went after her, suspecting her murder partner, Sofia, of getting involved in other things. Osman captured Teokles and the front of Theebali was blocked by Akca Dervis, Pehlivan and Zulfikar Dervis. After the trio, Bala Hatun took Osman to Edebali. I wonder what Edebali will tell Osman. What kind of plan will Dundar and Batur plan to plan for Dundar, whose daughter was kidnapped, and Zohre, who saw Osman as responsible for these events? What's the big surprise waiting for Kalanoz, who's going after Sofia and Helen.

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.

Nikola arrives in the nomad camp and claims he wants peace while Osman thinks he is about to meet his father but falls into an ambush set by Yavlak Arslan, Hazal Hatun's brother. Meanwhile, Osman's elder brother, Savcı, also returns from Crimea. Ertuğrul goes to meet Arslan Bey of the Çobanoğlu tribe and warns him not to become a traitor as he's dealt with them his whole life. Osman, who escapes Arslan's ambush, ambushes him and Geyhatu's son, Möngke's camp. However, Arslan and Möngke escape.

Arslan tasks Cerkutay, who is alive, to go to Geyhatu, who already hates him because of him being loyal to Balgay, and tell him that Osman captured Möngke. Geyhatu, who is in Konya planning to kill his brother, Argun, is angered over this and allows Cerkutay to live if he is loyal to him. Meanwhile, Söğüt perishes due to the disease spread by Flatyos on the orders of Nikola followed by an explosion done by the same people.

Osman Bey establishes his headquarters in Yenişehir, acting on crucial information from his spy in Constantinople. He faces threats from Northern warriors Olof and Frigg. Bala Hatun and Malhun Hatun prepare for a market in Yenişehir, leading to tensions between Bengi Hatun and Malhun Hatun. The competition between Aktemur and Alçiçek adds to the growing tension.

Osman Bey thwarts Kantakouzenos' plans in Constantinople, but the cunning strategist persists in his game. Kantakouzenos initiates a new strategy, enlisting Olof's aid as the first step. Olof, driven by revenge for his brother Saga, arrives in Yenişehir with his men at Kantakouzenos' behest. Their goal is to besiege Osman Bey, plotting to attack him from both external and internal fronts.

Olof's personal stake in Yenişehir drives him to take risks, while his lover Frigg poses a threat to Malhun Hatun. In Constantinople, Kantakouzenos involves Ofelia, further complicating matters. Osman Bey takes on the responsibility of confronting and resolving the chaos, arranging a meeting with Olof in the arena.

Years after the Bapheus victory, Osman Bey's children have become beys. As Osman Bey continues his conquest for Bursa, news arrives that Sultan Mesud has been poisoned, sparking a power struggle for the Sultanate. Bala Hatun, grieving the loss of her child, battles a serious illness. Germiyanoğlu Yakup Bey, who set up a market on the Yenişehir-Germiyan border, survives an assassination attempt marked by a Kayı, raising tensions with Osman Bey. Vasilis, a hidden enemy, plots to revive Rome amid the search for a new sultan. Osman Bey sends his son, Alaeddin Bey, to Konya following the poisoning news, where Yakup Bey’s daughter also arrives, with Yakup Bey aiming for the Sultanate. In weakened Konya, irregulars settle in Uçlar. Orhan Bey invites these Sancaksız irregulars to join Osman Bey’s holy war, and this news reaches Yakup Bey’s son, Mehmet. Amidst these events, poet Yunus Emre arrives in Yenişehir, potentially influencing Osman Bey's spiritual life.

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.

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, now leading a state, aims to unify the Turks under his banner, and influence border principalities. Bayhan Bey and his rival Begüm Hatun attend Osman Bey's wedding, possibly revealing intentions towards his daughter, Fatma Hatun. The arrival of the Caliph's vizier Emir Ömer stirs tension, his purpose unknown to Osman. Emir Ömer secretly informs Karesi Bey of the theft of sacred relics, prompting Karesi to seek them out and offer allegiance to Osman Bey. As Osman expands his territory, Byzantine hopes rest on Commander Lucas, who holds the sacred relics and plots against the Turks. Lucas tries to recruit Holofira, impacting her and Orhan Bey’s paths. Alaeddin Bey is imprisoned in a castle as Osman continues his conquests, facing Lucas's schemes.

Despite numerous challenges, Karadin Castle becomes Kayı property. Alaeddin Bey is exposed to danger during the conquest. Commander Lucas devises a plan to find and exploit the weaknesses of Osman Bey and Karesi Bey, aiming to set them against each other. Lucas, holding sacred relics, plans to use them as leverage. Osman Bey's tribe is alarmed when the relics are stolen, and he confronts Lucas. The fight for Karadin Castle ensues with Begüm Hatun and Bayhan Bey vying for control, while Bala Hatun remains disinterested. Holofira, under Lucas's orders, arrives uninvited at the celebration, rekindling her love with Orhan Bey, who proposes marriage. Saruca and Yusuf compete for Fatma Hatun's affection. During Gonca Hatun's difficult childbirth, Begüm and Hazal Hatun clash, with Begüm accusing Hazal of poisoning her.

Osman Bey's pledge to protect the sacred Islamic relics elates the Kayı tribe but fuels Karesi Bey's jealousy. To thwart Osman, Lucas sets a trap in Karadin, complicating Begüm Hatun's situation. After her setback, Begüm plots to undermine Bala Hatun. Meanwhile, it's revealed that Cecilia poisoned Gonca Hatun, straining her relationship with Holofira. Orhan Bey devises a plan to kidnap Holofira from her arranged marriage, but they encounter a trap. Lucas and Karesi plan to financially damage Osman by building a bridge. Osman discovers Karesi's deceit. The unfolding drama sees Gonca's feelings towards Holofira change, and the possibility of Orhan and Holofira's reunion.