Henry V reigned as King of England from 1413 until his death in 1422. He is best remembered for his pivotal role in the Hundred Years' War, during which he revitalised the English military campaign in France. His leadership and strategic ambition saw him achieve a legendary victory against the French at the Battle of Agincourt in 1415, a triumph that cemented his reputation as one of the most formidable warrior kings in medieval history.

Following his military successes, Henry V secured a significant diplomatic advantage through the Treaty of Troyes. This agreement recognised him as the heir and regent to the French throne, effectively uniting the crowns of England and France under his authority. Despite these substantial achievements, his reign was relatively short, and his untimely death prevented the long-term consolidation of his territorial settlements in France.

Key developments during his reign include:

• The renewal of the English claim to the French throne.
• The decisive English victory at the Battle of Agincourt.
• The diplomatic breakthrough of the Treaty of Troyes.
• The establishment of his position as heir to the French monarchy.
• The sudden conclusion of his rule due to his early death.