Duke Vincentio Timeline and Summary

1.1: The Duke announces that he's leaving town and puts Angelo in charge while he's away.
1.3: The Duke shows up at a monastery and asks to be disguised as a friar so he can spy on Angelo and his subjects.
3.1: The Duke goes to the prison to offer his support to the inmates and listens in on Isabella's conversation with Claudio about Angelo's proposition.
3.1: The Duke hatches a plan to trick Angelo into sleeping with Mariana without knowing it.
3.2: The Duke spies on Elbow and Pompey
4.1: The Duke accompanies Isabella to Mariana's isolated farmhouse.
4.2: The Duke comes up with a plan to substitute an inmate's head for that of Claudio.
5.1: The Duke removes his friar disguise and watches as Isabella confronts Angelo.
5.1: The Duke puts on another disguise.
5.1: The Duke removes his disguise and hands out a bunch of sentences.
5.1: The Duke pardons almost everyone and then proposes to Isabella.