Claudius and Gertrude greet Hamlet’s old friends Rosencrantz and Guildenstern, whom they summoned to Elsinore to figure out why Hamlet is so melancholy. Rosencrantz and Guildenstern happily agree to help.Polonius enters and says that he has figured out the cause of Hamlet’s lunacy. But, first, the ambassadors have returned from Norway. He goes to get them. While Polonius is gone, Gertrude remarks that Hamlet’s mania probably comes from his father’s death and her too-hasty marriage to Claudius.