Edward III (13 November 1312 – 21 June 1377) was King of England from 1327 until his death; he is noted for his military success and for restoring royal authority after the disastrous reign of his father, Edward II. Edward III transformed the Kingdom of England into one of the most formidable military powers in Europe; his reign also 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 is one of only five British monarchs to have ruled England or its successor kingdoms for more than 50 years.
Edward was crowned at age 14 after his father was deposed by his mother and her consort Roger Mortimer. At age 17,he led a successful coup against Mortimer, the de facto ruler of the country, and began his personal reign. After a successful campaign in Scotland he declared himself rightful heir to the French throne in 1337, starting what would become known as the Hundred Years' War. Following some initial setbacks the war went exceptionally well for England; victories at Crécy and Poitiers led to the highly favourable Treaty of Brétigny. Edward's later years, however, were marked by international failure and domestic strife, largely as a result of his inactivity and poor health. After his death, rivalry among his descendants caused the lengthy Wars of the Roses. Edward III, King of England in Wikipedia