امیرارسلان (محمدعلی فردین) با دیدن تصویری از فرخ‌لقا (فرزانه)، دختر پطرس شاه (منوچهر نوذری) دلشیفته او می‌شود. Roum was conquered by European invaders, and its pregnant Banu (lady) forced to flee for her life. She becomes wedded to an Egyptian merchant and gives birth to her child, Arsalan. The merchant claims the child as his own. Eventually, of course, Arsalan learns of his royal origins and takes it in his mind to reclaim his throne.