Gündoğdu

Gündoğdu was the older brother of Ertuğrul, and the oldest son of Suleyman Shah. Gundogdu fights alongside Ertugrul in Season 1 and Season 2. He makes no appearance in Season 3 and 4, and comes back toward the end of Season 5.

Season 1
Gundogdu is very ambitious. He becomes very angry with Suleyman Shah after he sends Ertugrul to Aleppo to find a place for their tribe to settle. Gundogdu‘s wife Selcan Hatun makes him deluded into wanting more power and become the Bey of the tribe. Selcan Hatun tries to make Ertugrul marry her sister Gokce, her sister. She uses black magic to try to make Gundogdu and her have a child. After having a miscarriage and her confessing to her actions, Gundogdu decides to marry another woman. However, after Selcan saves Gundogdu and almost dies herself, Gundogdu and everyone else forgives her. However their relationship remained broken, with Gundogdu not quite getting over her betrayl.

Season 2
he is among the Kayi tribe as they take refuge with the Dodurgas tribe. He searches for Ertugrul, who was captured by Noyan and was devistated when he learned that his brother had been killed. though this proved to be incorrect. He formed a close relationship with Tugtekin, though would frequently need to calm things down when the former became enraged with Kayi Alps. Gundogdu never believed that Ertugrul was a traitor and during his return to the tribe he had his most trusted Alps protect him. During a fight that broke out when Ertugrul was about to be executed, he along with many other Kayi Alps fought for his brother. Gundogdu was later made leader of the alps of both tribes.

Gundogdu was overjoyed to learn that his brother, Sungurtekin, was alive, though he frequently argued with him and Ertugrul, who constantly kept important information from both him and Hayme. During this time, while Gundogdu's relationship with Selcan was at an all time low, he met and fell in love with Gockele, the daughter of Gumstekin Bey and niece of Aytolun. He planned to marry her and told Selcan that he would not divorce her, as he had planned to, if she gave her consent for him to remarry. She did so, though the two of them remained more or less astranged until Selcan was captured by Noyan. Gundogdu, along with Hamza, Tutekin and several other alps, went to save Selcan by trading a fake Seal of Ohguz Khan. During this fight, Hamza betrayed Noyan and allied himself with Gundoglu, as the two of them had agreed. However, Hamza was quickly matryed by Noyan. During his final moments, Hamza expressed regret for turning on the Kayi Tribe and begged Gundoglu to forgive him. Gundogdu, along with all the other's gathered there agreed to forgive him and proceeded to bury him with full honors as a martyred Alp, once he had passed away. Gundogdu's relationship with Selcan improved after this, with him expressing remorse for having neglected her. though he still planned to marry Gockele.

He was once again put at odds with Ertugrul and Sungurtekin, when the two of them rightfully belived that gumestekin and Ameer Sabettin Koppek, had betrayed not only the tribe but almost the Seljuk Sultanate to the Mongols. Gundogdu argued with them both over Ertugrul's decision to confront and humiliate Gumestekin in front of the Alps. This action also led to Gumstekin ending his daughter's bethrodal to Gundogdu, much to the latter's saddness. However this did not last long as Ertugrul, Secan, Sungurtekin and Banu Cicek quickly proved Aytolun's roll in Korkut's death to Tutekin who intern informed the rest of his family about this deception.

Gundogdu was deeply remorseful to Selcan, whom he had shunned, thinking that she was up to her old tricks once more. This led to them resuming their relationship as husband and wife.

not long after Gumestekin was executed by Ertugrul, Gundogdu began to experience boils in his arm, which led to him and Hayme, having to leave the tribe for a time to visit a doctor. Gundogdu relinquished his position as head alp to his brother, Sungertekin, before leaving.

He returned later and was overjoyed to hear that Dundar had returned to the tribe and was also troubled that Yigit had been captured. This would ultimately lead to a deep rift forming between the son's of Suleman Shah. With Gundogdu and Sungertekin taking the part of Ameer Saddetin Kopek and trying to kill Yigit, while Ertugrul and Dundar tried to save Yigit and depose Saddetin in the eyes of the sultan. The culmination of his feud occured with Gundogdu calling for a vote for Bey. He nominated himself as his father's replacement, and Ertugrul ran agasint him.

Gundogdu's relationship with Dundar soured slightly, with him being opposed to Dundar joining Headquaters as a Bey, however Hayme pointed out that it was Dundar's right to join. His relationship with Ertugrul and Hayme also soured greatly, once they found out that Gundogdu had brided several of the bey's to vote for him.

This feud ultimately led to the splitting of the Kayi Tribe, with a small portion of them, along with several Dugdora Alps joining Ertugrul on his journey West to the Byzantine border, while the rest of them followed Gundogdu East to Ahlat.

Season Five
Gundogdu, along with Selcan, his children and Sungertekin visited the Kayi tribe of the west