Possible Clues:

• Iago was passed over for him
• One accused of being Desdemona's lover (Othello)
• Officer protects fool, one in role of lieutenant
• He said 'My reputation, Iago, my reputation!'
• Object of Othello's jealousy
• Lieutenant in Othello
• Lieutenant dismissed by Othello
• Othello's lieutenant catches cold at exotic oasis
• In Shakespeare, conspirator dropping us for old lieutenant
• Lieutenant in Cyprus has pack animal, one kept by officer