FTP, name this type of creature who tells of being murdered by his brother Claudius in Act I of Hamlet.
They appear in the prologue to Fulke Greville's Alaham and in Thomas Hughes's The Misfortunes of Arthur.  In addition to Gorlois and the King of Ormus, one appears in Catiline which was singled out for special praise by T. S. Eliot in his essay on Ben Jonson.  A duke of Genoa named Andrugio is one in John Marston's Antonio's Revenge, while another is the lover of Bel-Imperia, Don Andrea, who appears in the frame narrative of The Spanish Tragedy.  One of them throws earth on Flamineo in Act V of The White Devil.  In Act IV of Julius Caesar, one of them promises to see Brutus at Philippi.  Another one sits in the title character's chair in Act III of Macbeth, while the most famous one threatens to tell a tale which would make his son's hair stand on end "like quills upon the fretful porpentine."  FTP, name this type of creature who tells of being murdered by his brother Claudius in Act I of Hamlet.
They appear in the prologue to Fulke Greville's Alaham and in Thomas Hughes's The Misfortunes of Arthur.  
a ghost