A historical biography that chronicles the life of Osman bin Ertuğrul bin Suleyman Shah, the founder of the Ottoman Empire, which ruled various parts of the world for six centuries.
Osman Bey, who angered the emperor and Constantinople with his seizure of Kulucahisar Castle, brings peace to the end of the region. The Byzantine Emperor takes measures against Osman Bey.
In season four, Osman continues to fight enemies and traitors, while his reckless young son refuses to remain under his leadership and seeks to reach power.