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Abdurrahman Gazi is believed to have been born near the end of the 12th century, but his place of birth is unknown. He is believed to have been a prominent warrior in the periods of Ertuğrul Gazi, Osman Gazi and Orhan Gazi.[2]
While Akça Koca [tr], Samsa Çavuş [tr] and Konur Alp, along with other military figures of the Ottoman beylik, were busy with attacks on Akyazı, İznik and İzmit respectively,[5] Abdurrahman Gazi organized raids to the fortresses on the Istanbul side. Until Bursa was conquered, he served as a fighter in the Ottoman-Byzantine border area.[1]
In 1328, Abdurrahman Gazi was sent by Orhan Gazi to besiege Aydos Castle, a prolonged conquest. The castle was allegedly conquered after the Tekfur's daughter experienced a dream of Abdurrahman saving her, prompting her to help Abdurrahman seize the castle, betraying her father.[4]
After the conquest, Abdurrahman is said by historian Halil İnalcık to have married the Tekfur's daughter on Orhan Bey's request, and to have had a son with her.[6]