Final answer:
In Shakespeare's 'Hamlet', King Hamlet defeated King Fortinbras, which resulted in Norway's land being forfeited to Denmark, intensifying political tensions.
Step-by-step explanation:
The conflict between King Hamlet and King Fortinbras of Norway is a backstory in William Shakespeare's play, The Tragedy of Hamlet, Prince of Denmark. This conflict resulted in King Hamlet slaying King Fortinbras in combat, which led to the Norwegian king losing his lands to Denmark as part of the terms laid out in the elder Fortinbras's wager on the duel. This outcome sets the stage for many of the political tensions and actions in the play, including the desire for revenge by young Fortinbras, the son of the fallen king.