The first incident, featured in Act I, Scene 1, in which Iago and his sidekick Roderigo inform Brabantio that Othello stole his daughter Desdemona was definitely planned. When the upset Brabantio, who is awoken from sleep in the middle of the night, discovers his daughter is indeed missing, he immediately takes steps to have Othello arrested, as indicated in his question to Roderigo:
Do you know
Where we may apprehend her and the Moor?
Secondly, Iago disappeared during Brabantio's discourse with Roderigo in the above incident in order to be with Othello. This, too, was planned, as he told Roderigo:
Yet, for necessity of present life,
I must show out a flag and sign of love,
Which is indeed but sign.
Iago wanted to convince the general that he is there for him and purposely bad-mouths Brabantio in the process. Othello believed his so-called "faithful" ensign.
In Act II, Scene 3, in Cyprus, Iago and Roderigo set up Cassio and he is dismissed from his post as lieutenant by Othello. In this...
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