Long ago, there was a king. 
Long ago, a boy named Edward became king. 

Edward III was a king of England. 
Edward led many wars. He fought in Scotland to win back land. He also started a very long war with France. 

Edward III was a very important King of England. 
At first, a man named Roger Mortimer ruled England for the young king. Mortimer was not a kind leader and he took land from many nobles. Edward eventually decided to take control for himself. In October 1330, Edward and his friend William Montagu captured Mortimer at Nottingham Castle. 
Edward III is most famous for his many military successes. He first fought in Scotland to win back lands that had been lost. 
During the war, Edward won some very big battles. He had great victories at Crécy and at Poitiers. These wins led to the Treaty of Brétigny in 1360. This treaty gave England more land and was very good for the country. However, things changed as Edward got older. He became sick and had trouble managing his government. By 1375, England had lost most of the land it won in France. Only the area called the Pale of Calais remained.
Edward III's life shows how much one person can change a nation. He turned England into a very strong military power. 
Edward III was the King of England from 1327 until his death in 1377. 
To understand Edward's rise, one must look at the difficult reign of his father, Edward II. The elder king was very unpopular with the nobility and the common people. He relied on personal favorites like Hugh Despenser the Younger instead of the established nobles. This caused deep distrust among the people who held power in England. By 1325, many landholders felt unsafe under his rule. Eventually, Edward's mother, Isabella of France, and her lover, Roger Mortimer, took control. They deposed Edward II, and the young prince was crowned king at age fourteen in 1327.
During the early years of his reign, Edward III did not rule alone. Roger Mortimer acted as the de facto ruler of England. Mortimer was an unpopular leader who used his position to take estates and titles from others. The tension between the young king and his guardian grew over time. In 1330, Edward decided to take direct action to secure his own power. Aided by William Montagu, the 3rd Baron Montagu, Edward captured Mortimer at Nottingham Castle. 
Edward's military focus began with campaigns in Scotland. A group called The Disinherited had invaded Scotland to install Edward Balliol as king. Edward III responded by winning the Battle of Halidon Hill and besieging Berwick. He successfully reinstated Balliol to the throne and gained land in southern Scotland. However, maintaining control over Scotland proved difficult as loyalists to the true Scottish king, David II, rose up. Edward eventually agreed to a truce with the Scots in 1338 to focus on other growing threats.
One major threat was the relationship between France and Scotland. An alliance between these two nations meant England might have to fight wars on two different fronts. To assert his own power, Edward III declared himself the rightful heir to the French throne. This claim started the Hundred Years' War in 1337. This conflict would last for many decades and fundamentally change European politics.
The first phase of this war is known as the Edwardian War. It saw major English victories at the battles of Crécy and Poitiers. These successes led to the Treaty of Brétigny in 1360. Under this treaty, England made significant territorial gains in France. Edward even renounced his claim to the French throne at that time to secure the deal. 
Edward III was a complex man with many different sides to his personality. He was a conventional medieval king who focused heavily on warfare, but he also had many non-military interests. He was known to be temperamental, yet he was also capable of unusual clemency, or mercy. He even believed he could perform the royal touch to heal people. 
When Edward III died in 1377, he left behind a transformed kingdom. 
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