 Roderigo has opened his purse to Iago in the mistaken belief that Iago is using his money to pave the way to Desdemona's bed.When the assassination of Michael Cassio runs amiss, Iago fatally wounds Roderigo.Shakespeare's source for "Othello" was the tale "Un Capitano Moro" by Cinthio, and, while Shakespeare closely followed his source in composing "Othello", Roderigo has no counterpart in Cinthio.