"King Uther Pendragon, ruler of all Britain, had been at war for many years with the Duke of Tintagil in Cornwall when he was told of the beauty of Lady Igraine, the duke's wife." (1-3)
I'm Queen Igraine.
I'm Duke of Tingagil.
"In the course of the feast, King Uther grew passionately desirous of Igraine and, when it was over, begged her to become his paramour. Igraine, however, being naturally loyal as she was beautiful, refused him." (7-9)
"Igraine has broken my heart, and unless I can win her, I shall never recover." (26-27)
What do I do?!
"Tonight you shall appear before Igraine at Tintagil in the likeness of her husband, the duke." (44-45)
King Uther asks Merlin the Prophet for help.
She actually thinks I'm him!
"The plan succeeded: Igraine was completely decided by the king's impersoation of the duke, and gave herself to him..." (49-50)
"The marriage of King Uther and Igraine was celebrated joyously 13 days later." (62-63)