He is the Prince of Denmark, nephew to the usurping Claudius, and son of King Hamlet, the previous king of Denmark. At the beginning of the play, he struggles with whether, and how, to avenge the murder of his father, and struggles with his own sanity along the way. By the end of the tragedy, Hamlet has caused the deaths of Polonius, Laertes, Claudius, and Rosencrantz and Guildenstern, two acquaintances of his from childhood