Duke Timeline and Summary

Vindice wants revenge against the Duke for poisoning his fiancée because she wouldn't sleep with him.
We see the Duke in action, and guess what? He's not too just, and kind of hypocritical.
The Duke is able to thwart his stepsons and experience a bit of self-awareness. Too little, too late.
The Duke comes to a deserted place, believing Vindice has found a woman for him to sleep with. He kisses what he takes to be a real woman, then slowly realizes it's the poisoned skull of Vindice's fiancée. He dies.