The Four members consisted of Bruges

Bruges

Bruges is the capital and largest city of the province of West Flanders in the Flemish Region of Belgium. It is located in the northwest of the country....

, Franc of Bruges, Ghent

Ghent

Ghent is a city and a municipality located in the Flemish region of Belgium. It is the capital and biggest city of the East Flanders province. The city started as a settlement at the confluence of the Rivers Scheldt and Lys and in the Middle Ages became one of the largest and richest cities of...

 and Ypres

Ypres

Ypres is a Belgian municipality located in the Flemish province of West Flanders. The municipality comprises the city of Ypres and the villages of Boezinge, Brielen, Dikkebus, Elverdinge, Hollebeke, Sint-Jan, Vlamertinge, Voormezele, Zillebeke, and Zuidschote...

 gathered together in a medieval parliament

Parliament

A parliament is a legislature, especially in those countries whose system of government is based on the Westminster system modeled after that of the United Kingdom. The name is derived from the French , the action of parler : a parlement is a discussion. The term came to mean a meeting at which...

. Together they exercised considerable power in Flanders

Flanders

Flanders is the community of the Flemings but also one of the institutions in Belgium, and a geographical region located in parts of present-day Belgium, France and the Netherlands. "Flanders" can also refer to the northern part of Belgium that contains Brussels, Bruges, Ghent and Antwerp...

.

During the Hundred Years' War

Hundred Years' War

The Hundred Years' War was a series of separate wars waged from 1337 to 1453 by the House of Valois and the House of Plantagenet, also known as the House of Anjou, for the French throne, which had become vacant upon the extinction of the senior Capetian line of French kings...

, Jacob van Artevelde

Jacob van Artevelde

Jacob van Artevelde , also known as the Wise Man and the Brewer of Ghent, was a Flemish statesman and political leader....

 a prominent merchant with business interests in the wool trade with England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

, led a revolt against Louis I, the Count of Flanders

Count of Flanders

The Count of Flanders was the ruler or sub-ruler of the county of Flanders from the 9th century until the abolition of the position by the French revolutionaries in 1790....

 who had sided with the French

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. Originally, in 1339 he organised the towns of Bruges, Ghent and Ypres together as the Three Members. Then in 1386 under Philip the Bold

Philip the Bold

Philip the Bold , also Philip II, Duke of Burgundy , was the fourth and youngest son of King John II of France and his wife, Bonne of Luxembourg. By his marriage to Margaret III, Countess of Flanders, he also became Count Philip II of Flanders, Count Philip IV of Artois and Count-Palatine Philip IV...

, Franc of Bruges was added, turning the organisation into the Four Members.