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what is Brabanzio's warning to Othello
He has been trying to get them to agree to a marriage between him and Desdemona. Neither is interested.
In Shakespeare's Othello, Roderigo had no relationship with brabantio nor Desdemona. He liked Desdemona and wanted to be with her but she was madly in love with the moor.
Roderigo had previously asked to marry Desdemona, but neither she nor Brabantio was impressed by the idea.
Iago gets him to identify himself as the hooligan shouting in the street to Brabantio. It is of course Iago who is guilty of the most crude and vile comments, but Roderigo is is 'fool' and takes the blame.
Roderigo was created in 1603.
Brabantio is wakened by Iago and Roderigo making a lot of noise in the street. He sees Roderigo, who identifies himself, but does not see Iago, who is making foul-mouthed suggestions like "an old black ram is tupping your white ewe." Roderigo has been courting Desdemona and although Brabantio has turned him out of the house he keeps on hanging around like a stalker. Brabantio doesn't like him already and likes him less for waking him up with scurrilous suggestions. This all changes when Brabantio finds out that his daughter has in fact disappeared. Then he turns to Roderigo for help in finding her, which Roderigo is happy to supply. By the end of the scene, he is "good Roderigo" to Brabantio.
roderigo dies
Brabantio is Desdemona's father. Iago and Roderigo wake him to tell him that Desdemona is running off with Othello. Using filthy and racist language, Iago hopes to anger Brabantio against Othello, which he does.
During the brawl, Iago kills Roderigo.
Roderigo was in love with Desdemona, who married Othello instead.
Roderigo and Iago have several long conversations in which Iago responds to Roderigo many times. The question needs to be more specific.