The Dering Manuscript is the earliest extant manuscript text of any play by William Shakespeare. The manuscript combines Part 1 and Part 2 of Henry IV into a single-play redaction. Scholarly consensus indicates that the manuscript was revised in the early 17th century by Sir Edward Dering, a man known for his interest in literature and theater. Dering prepared his redaction for an amateur performance starring friends and family at Surrenden Manor in Pluckley, Kent, where the manuscript was discovered in 1844. This is the earliest known instance of an amateur production of Shakespeare in England. Sourced from the 1613 fifth quarto of Part 1 and the 1600 first quarto of Part 2, the Dering Manuscript contains many textual differences from published quarto and folio editions of the plays. Dering cut nearly 3,000 lines of Shakespearean text and added some 50 lines of his own invention along with numerous minor interventions. The Dering Manuscript is currently a part of the collection at the Folger Shakespeare Library in Washington, DC.

Henry IV, Part 1 is a history play by William Shakespeare, believed to have been written not later than 1597. The play dramatises part of the reign of King Henry IV of England, beginning with the battle at Homildon Hill late in 1402, and ending with King Henry's victory in the Battle of Shrewsbury in mid-1403. In parallel to the political conflict between King Henry and a rebellious faction of nobles, the play depicts the escapades of King Henry's son, Prince Hal, and his eventual return to court and favour.