Supplementary Materials
Hamlet is often called an Elizabethan revenge play, the theme of revenge against an evil usurper driving the plot forward as in earlier stage works by Shakespeare's contemporaries, Kyd and Marlowe, as well as by the French writer Belleforest (Histoires Tragiques, 1576). As in those works, a hero plays minister and scourge in avenging a moral injustice, an affront to both man and God. In this case, regicide (killing a king) is a particularly monstrous crime, and there is no doubt as to whose side our sympathies are disposed.
As in many revenge plays, and, in fact, several of Shakespeare's other tragedies (and histories), a corrupt act, the killing of a king, undermines order throughout the realm that resonates to high heaven. We learn that there is something "rotten" in Denmark after old Hamlet's death in the very first scene, as Horatio compares the natural and civil disorders that occurred in Rome at the time of Julius Caesar's assassination to the disease that afflicts Denmark. These themes and their figurative expression are common to the Elizabethan revenge play genre in which good must triumpph over evil.
The above preface to Hamlet was taken from www.geocities.com/othellopage/hamlet.html