Engin altan duzyatan refused the role ( the main character Ertugrul ) twice. Although he really liked the script but he said that historical tv series ends either being a huge hit or bad in a comedy way. But at the end he took it.
In 1200s, Turks have slant eyed and The majority of Turks believed Tengrism religion. Islam was new religion for Turks. In the series, Actors who haven’t slant eyed play Mongols.