Pale of Calais in the context of "Treaty of Brétigny"

Edward III (13 November 1312 – 21 June 1377), also known as Edward of Windsor before his accession, was King of England from January 1327 until his death in 1377. He is noted for his military success and for restoring royal authority after the disastrous and unorthodox reign of his father, Edward II. Edward III transformed the Kingdom of England into one of the most formidable military powers in Europe. His fifty-year reign is one of the longest in English history, and saw vital developments in legislation and government, in particular the evolution of the English Parliament, as well as the ravages of the Black Death. He outlived his eldest son, Edward the Black Prince, and was succeeded by his grandson, Richard II.

Edward was crowned at age fourteen after his father was deposed by his mother, Isabella of France, and her lover, Roger Mortimer. At the age of seventeen, he led a successful coup d'état against Mortimer, the de facto ruler of England, and began his personal reign. After a successful campaign in Scotland, he declared himself rightful heir to the French throne, starting the Hundred Years' War (1337–1453). Following some initial setbacks, this first phase of the war went exceptionally well for England and would become known as the Edwardian War. Victories at Crécy and Poitiers led to the highly favourable Treaty of Brétigny (1360), in which England made territorial gains, and Edward renounced his claim to the French throne. Edward's later years were marked by foreign policy failure and domestic strife, largely as a result of his decreasing activity and poor health. The second phase of the Hundred Years' War began in 1369, leading to the loss of most of Edward's conquests, save for the Pale of Calais, by 1375.

Calais (UK: /ˈkæleɪ/ KAL-ay, US: /kæˈleɪ/ kal-AY, traditionally /ˈkælɪs/ KAL-iss, French: [kalɛ] ) is a French major port city in the Pas-de-Calais department, of which it is a subprefecture. Calais is the largest city in Pas-de-Calais. The population of the city proper is 67,544; that of the urban area is 144,625 (2020). Calais overlooks the Strait of Dover, the narrowest point in the English Channel, which is only 34 km (21 mi) wide here, and is the closest French town to England. The White Cliffs of Dover can easily be seen from Calais on a clear day. Calais is a major port for ferries between France and England, and since 1994, the Channel Tunnel has linked nearby Coquelles to Folkestone by rail.

Because of its position, Calais has been a major port and an important centre for transport and trading with England since the Middle Ages. Calais came under English control after Edward III of England captured the city in 1347, followed by a treaty in 1360 that formally assigned Calais to English rule. Calais grew into a thriving centre for wool production, and came to be called the "brightest jewel in the English crown" because of its importance as the gateway for the tin, lead, lace and wool trades (or "staples"). Calais remained under English control until its recapture by France in 1558.

The French siege of Calais in early 1558 was part of the Italian War of 1551–1559 between France and England and their respective allies. It resulted in the seizure of the town and its dependencies by France.

The Pale of Calais had been ruled by England since 1347, during the Hundred Years' War. By the 1550s, England was ruled by Mary I of England and her husband Philip II of Spain. When the Kingdom of England supported a Spanish invasion of France, Henry II of France sent Francis, Duke of Guise, against English-held Calais, defended by Thomas Wentworth, 2nd Baron Wentworth. Following an initial failure in mid-1557, a renewed attack captured the outlying forts of Nieullay and Risbank from the English forces and Calais was besieged.

The Battle of Agincourt (/ˈædʒɪnkɔːr(t)/ AJ-in-kor(t); French: Azincourt [azɛ̃kuʁ]) was an English victory in the Hundred Years' War. It took place on 25 October 1415 (Saint Crispin's Day) near Azincourt, in northern France. The unexpected victory of the vastly outnumbered English troops against the French army boosted English morale and prestige, crippled France, and started a new period of English dominance in the war. That advantage lasted for 14 years, until England was defeated by France in 1429 during the Siege of Orléans.

After several decades of relative peace, the English had resumed the war in 1415 amid the failure of negotiations with the French. In the ensuing campaign, many soldiers died from disease, and the English numbers dwindled; they tried to withdraw to English-held Calais but found their path blocked by a considerably larger French army. Despite their numerical disadvantage, the battle ended in an overwhelming victory for the English.