The play centers on the historical figure of Sir John Oldcastle, a Lollard martyr whose life is dramatized amidst the political and religious volatility of the early fifteenth century. The protagonist, Oldcastle, navigates a landscape defined by shifting loyalties, ecclesiastical pressure, and the demands of the English crown. As a nobleman caught between his personal convictions and the expectations of King Henry V, he faces mounting opposition from religious authorities and political rivals. The narrative framework follows the conventions of Elizabethan history plays, utilizing a blend of public spectacle and private moral conflict to explore the tensions of the era.

Discussion often centers on the collaborative nature of the play, as it was written by a team of prominent Elizabethan dramatists. Readers frequently highlight the work as a direct response to the portrayal of Falstaff in Shakespeare’s Henry IV, which had previously used the name Oldcastle. Scholars examine the text for its bibliographical significance and its role in the development of the history play genre. The play is recognized for its attempt to rehabilitate the reputation of a historical figure through dramatic representation. Critics often analyze the balance between the play's didactic religious themes and its more conventional theatrical entertainment value.