King of England. The man who started the Hundred Years' War by claiming the French throne and declaring war on Philip VI. While he enjoyed significant military success in the first half of his reign, the latter half was marked by the loss of most territories gained in France and the devastation of the Black Death. In his final years, physical and mental decline led to political neglect and deep conflict with Parliament, culminating in the Good Parliament of 1376 where his administration was harshly criticized. Nevertheless, he achieved results far beyond England's national strength at the time, establishing the Kingdom of England as a major power in the eyes of neighboring nations. He died of a stroke on June 21, 1377.

King of France. Known as Philip the Fortunate. He died on August 22, 1350.

The Kingdom of England existed from 927, when Athelstan, King of the Anglo-Saxon Heptarchy, unified all of England, until the Union with the Kingdom of Scotland in 1707. While King Egbert's unification in 825 is often cited as the beginning, his actual title was Bretwalda. The English side.

The origins of the Kingdom of France trace back to the Frankish Kingdom; the name 'France' is a phonetic evolution of 'Frank'. In historiography, West Francia and the Kingdom of France refer to the same entity; generally, it is called the Kingdom of France from the coronation of Hugh Capet in 987 onwards, and West Francia prior to that.

Incompetent. The king who lost most of England's continental territories in France. Technically deceased by this era, but he can be featured in flashback scenes. His full name was John Plantagenet.

The Duchy of Brittany was a sovereign duchy in western continental Europe that later became part of the Kingdom of France. Its territory included the modern Brittany region and the department of Loire-Atlantique. Initially aligned with England, they may switch sides if England begins to lose decisively. The capital is Nantes (where the Edict of Nantes was later issued).