Henry Bolingbroke, Duke of Lancaster, aided by the Earl of Northumberland and his son Harry Percy deposed the rightful King, Richard II, and Bolingbroke ascend the throne as King Henry IV. Richard was imprisoned and later murdered in Pomfret Castle. Henry, in remorse, vows a pilgrimage to the Holy Land. Northumberland and Hotspur become dissatisfied with the King's lack of favour. Henry is worried about the behaviour of his son, the Prince of Wales. (Covers 1 Henry IV Acts 1 & 2)

The Percy family, Henry Bolingbroke's chief allies in deposing and murdering Richard II, have been cheated of their just rewards and now plot to overthrow the King. Worcester, the architect of their rebellion, arranges a meeting in Wales to decide how Great Britain will be divided among them. The King's army, part of it commanded by Prince Hal, marches westward to encounter the rebels. Even Sir John Falstaff receives a commission and marches off to join the battle at Shrewsbury. (Covers Act 3 S1—conclusion)