sentences:  The sonnet, like the others in this sequence, addresses the "Dark Lady" as if a mistress.It references allegations from unspecified others that her "black" complexion makes her unattractive and rebuts these, but in the final two lines turns the compliment into a backhanded one by admitting that "In nothing art thou black save in thy deeds".The sonnet employs the Petrarchan conceit of "tyranny" to imply the power the object's beauty imposes over the sonneteer and argues for her beauty based on the power she exerts over him.