By that piece in line 3, Duke meant the painting or portrait of the Duchess.
In "My Last Duchess", by Robert Browning, the character of Duke is portrayed as having controlling, jealous, and arrogant traits. These traits are not all mentioned verbally, but mainly through his actions.
The poet’s inspiration for this poem came from the Duke and Duchess Ferarra. The Duchess died under very suspicious circumstances. She was married at fourteen and dead by seventeen. Browning uses these suspicious circumstances as inspiration for a poem that dives deep into the mind of a powerful Duke of Ferarra who wishes to control his wife in every aspect of her life, including her feelings.
To know more about Duke, click below-
https://brainly.com/question/23857230
#SPJ4