The Southampton Plot was a conspiracy to depose King Henry V of England, revealed in 1415 just as the king was about to sail on campaign to France as part of the Hundred Years' War. The plan was to replace him with Edmund Mortimer, 5th Earl of March.
Portchester Castle, where the Southampton Plot was revealed to King Henry V
Henry V, also called Henry of Monmouth, was King of England from 1413 until his death in 1422. Despite his relatively short reign, Henry's outstanding military successes in the Hundred Years' War against France made England one of the strongest military powers in Europe. Immortalised in Shakespeare's "Henriad" plays, Henry is known and celebrated as one of the greatest warrior-kings of medieval England.
Miniature in the Regement of Princes by Thomas Hoccleve, c. 1411–1413
Henry's father, Henry IV
A gold noble coin of Henry V
Later portrait of Henry, late 16th or early 17th century