So far beneath your soft and tender breeding,
And since you call’d me master for so long,
Here is my hand: you shall from this time be
Your master’s mistress.

– William Shakespeare

Twelfth Night, Act 5, Scene 1. Duke Orsino, who has been in love with and pursuing Olivia for the entire play, now at the end changes his mind and announces that he is in love with Viola. When he learns that Cesario is in fact Viola, he switches his love from Olivia to Viola in an instant.