The speaker uses possessive pronouns such as "my" to show he has ownership of the duchess and shows that she is a possession not an individual . The speaker refers to her as "my duchess" , "my wife" and "my love" showing the lack of affection the duke has for the duchess. This further shows the duchess is an accessory not a partner , as well as showing his power over her he shows jealousy and suggests he feels a wife should only be seen and enjoyed by their husband