Who is Horatio? Why do you thnk the guards want to tell him about the strange happenngs on the roof ofthe castle?

Horatio is Hamlet's closest friend. They know each other from the University of Wittenberg, where they are both students. Horatio is presented as a studious, skeptical young man, perhaps more serious and less ingenious than Hamlet but more than capable of trading witticisms with his good friend. The guards know that Horatio is a fair minded and learned man. They want Horatio to witness the ghost and then tell Hamlet.