The Spanish Tragedy, or Hieronimo is Mad Again is an Elizabethan tragedy written by Thomas Kyd between 1582 and 1592. Highly popular and influential in its time, The Spanish Tragedy established a new genre in English theatre: the revenge play or revenge tragedy. The play contains several violent murders and personifies Revenge as its own character. The Spanish Tragedy is often considered to be the first mature Elizabethan drama, a claim disputed with Christopher Marlowe's Tamburlaine, and was parodied by many Elizabethan and Jacobean playwrights, including Marlowe, William Shakespeare and Ben Jonson. Many elements of The Spanish Tragedy, such as the play-within-a-play used to trap a murderer and a ghost intent on vengeance, appear in Shakespeare's Hamlet. (Thomas Kyd is frequently proposed as the author of the hypothetical Ur-Hamlet that may have been one of Shakespeare's primary sources for Hamlet.) Source: Wikipedia (en)