to make cassio mad to he can get in a fight with him because cassio has a hot temper
so iago tell this to roderigo to Othello could release Cassio of his position as lieutenant .
Iago gets Cassio drunk in the night so after he is drunk Roderigo comes out and makes Cassio angry again so they get in a fight during they fighting some one goes and ring the bell to Othello could be awerd so Otello comes out of his room and he ask whtas going on so Montano tells him and Othello said that even thouhg as much he loves him he has to discharged him out of his position of lieutenant .
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Iago tells Cassio to go and talk to Desdemona have have her convince Othello to forgive him.
He proposes that they should wake Brabantio and set him against Othello for secretly marrying Desdemona.
Primarily the fact that Iago has suggested to him that that is what is being talked about. By this point, Iago has got Othello into such a state he cannot interpret anything Cassio or Desdemona does as being innocent.
Iago wanted Cassio to drink more wine because he wanted Cassio to be drunk and argumentative when Roderigo would approach him later that night. Iago told Montano that Cassio was drunk every night. He wanted to cast doubt on Othello's judgment for appointing Cassio, by implying that Cassio may be drunk during battle. This led to Othello stripping Cassio of his position. Othello thought that Cassio was irresponsible and dishonourable.
Bianca
Othello commits suicide. Iago is sentenced to torture. Cassio becomes governor of Cyprus.
Iago had lied to Othello and convinced him that Desdemona was secretly having sex with Cassio.