What are some famous examples of betrayal?

Famous examples of betrayal include Julius Caesar's assassination, where he was betrayed by his close friend Brutus, leading to the iconic phrase "Et tu, Brute?" Another notable instance is the betrayal of Jesus by Judas Iscariot, who famously betrayed him for thirty pieces of silver. In literature, Shakespeare's play "Othello" features Iago betraying Othello, manipulating him to bring about his downfall. These examples highlight the profound impact of betrayal on personal relationships and historical events.