The Golden Blade

The Golden Blade is an adventure film from 1953 directed by Nathan Juran and starring Rock Hudson as Harun AlRashid and Piper Laurie as Princess Khairuzan. It is set in ancient Bagdad and borrows from the Arabic fairy tales of One Thousand and One Nights as well as the myth of King Arthur and the Sword in the Stone.

Meanwhile, in the palace, sinister Vizier Jafar George Macready urges Badgads Caliph to fight Basra, but the Caliph refuses. Khairuzan, who is in fact the princess, is soon brought in by her guard, Jafars dimwitted son Hadi Gene Evans. Jafar convinces the Caliph that Khairuzans headstrong ways may be tamed by marriage to his son, then later plots with Hadi to undermine the Caliph by inciting more battles against Basra. When Khairuzan learns of the arranged marriage, she escapes again and disguises herself as a boy. Harun is waiting outside for an audience with Jafar, and when the guards spot Khairuzan, she steals Haruns horse. She is finally caught by both Hadi and Harun, who begin a fight which Harun wins. He discovers that he is actually invincible while wielding the golden sword.Khairuzan claims to be a boy slave and Harun brings her to the city, where she eavesdrops as Barcus reveals that the swords first inscription promises that whoever unsheathes the sword will gain the throne. Later, Harun, realizing that Khairuzan is a girl, protects her when a guard questions them, and they are both thrown to the dungeon, where they fall in love and kiss. After a minor quarrel, Khairuzan makes herself known to the guards and moves back to her harem. Knowing of the swords magical powers, she declares that only the winner of a tournament may claim her hand. She names Harun as her guard, and although he is infuriated to discover she is a princess and he her servant, he later watches admiringly as she is very kind to the poor townspeople. ........

Source: Wikipedia