The poem "My Last Duchess" is a dramatic monologue written by Robert Browning, coming from the Duke of Ferrara. In the poem he displays his megalomaniac tendencies towards his late wife and how he feels his title symbolises his power over her. We also learn how he doesn't want his wife for love but to be able to exhibit her and 'show her off' and enforce psychological power over.
The Duke calls her "My Last Duchess"; here the use of the possessive pronoun indicates to the reader how he feels his wife belongs to him. This implies that the Duke has an authoritative and almost overbearing character as he thinks of his wife more as an object, which he owns rather than a person. The Duke proves his power even further by saying "Notice Neptune, though, / Taming a sea horse". Here he relates himself to Neptune, the god of the seas showing how he believes himself to be god-like. Also the Duke believes himself to be above the level of common people saying he would never "stoop" down to their level. From this we can presume the Duke is afraid of losing his power, and would rather hold his head up high and suffer for it rather than "stoop". The use of this word indicates how the Duke is in a state of mind where he sees himself as superior against others.
However as we read on we learn that the Duke has limited control over his wife. He states that "She had a heart...to soon made glad",