Three different early versions of the play are extant: the first Quarto the second Quarto and the first Folio. Each version includes lines and entire scenes missing from the others. The play's structure and depth of characterisation have inspired much critical scrutiny. One such example is the centuries old debate about Hamlet's hesitation to kill his uncle which some see as merely a plot device to prolong the action but which others argue is a dramatisation of the complex philosophical and ethical issues that surround cold blooded murder calculated revenge and thwarted desire. More recently psychoanalytic critics have examined Hamlet's unconscious desires while feminist critics have re evaluated and attempted to rehabilitate the often maligned characters of Ophelia and Gertrude. The protagonist of Hamlet is Prince Hamlet of Denmark son of the recently deceased king Hamlet and newphew of King Claudius his father's brother and successor. Claudius hastily married King Hamlet's window Gertrude Hamlet's mother and throne for himself. Denmark has a long standing feud with neighbouring Norway in which King Hamlet slew king Fortin bras of Norway in a battle some years ago. Although Denmark defeated Norway and the Norwegian throne to fell king fortin b*a's infirm brother Denmark fears that invasion led by the dead Norwegian king's son Prince Fortin bras is imminent. On a cold night on the ramparts of Elsinore and Danish royal castle the sentries Bernardo and Marcellus discuss a ghost resembling the late king Hamlet which they have recently seen and bring Prince Hamlet's friend Horatio as a witness. After the ghost appears again the three vow to tell Prince Hamlet what they have witnessed.