Watch Kuruluş Osman Season 3, Episode 26: Episode 90 online on FlixGems. The epic continuation of Diriliş Ertuğrul, Kuruluş Osman follows Osman Bey — son of Ertuğrul and destined founder of the Ottoman Empire — as he transforms a small Turkic tribe into a sovereign state. Battling the Byzantine Empire, Mongol forces and treachery from within, Osman must prove himself as both a warrior and a leader. A sweeping historical action drama built on faith, honour and the birth of one of history's greatest empires.