The Treaty of Montreuil-sur-Mer (finalised 28 July 1274) was an agreement between

Edward I of England Edward I (17/18 June 1239 – 7 July 1307), also known as Edward Longshanks and the Hammer of the Scots, was King of England and Lord of Ireland from 1272 to 1307. Concurrently, he ruled the duchies of Aquitaine and Gascony as a vassa ...

and

Guy, Count of Flanders Guy of Dampierre (french: Gui de Dampierre; nl, Gwijde van Dampierre) ( – 7 March 1305, Compiègne) was the Count of Flanders (1251–1305) and Marquis of Namur (1264–1305). He was a prisoner of the French when his Flemings defeated th ...

, providing for free movement of merchants between their territories and effectively abolishing customs charged on English merchants in Flanders. It ended a four-year trade war that had begun on 1 September 1270 when

Margaret of Constantinople Margaret, often called Margaret of Constantinople (1202 – 10 February 1280), ruled as Countess of Flanders during 1244–1278 and Countess of Hainaut during 1244–1253 and 1257–1280. She was the younger daughter of Baldwin IX, Count of F ...

Countess of Flanders The count of Flanders was the ruler or sub-ruler of the county of Flanders, beginning in the 9th century. Later, the title would be held for a time, by the rulers of the Holy Roman Empire and Spain. During the French Revolution, in 1790, the co ...

, impounded the wares of English merchants in Flanders for their king's non-payment of a money fief. The commercial dispute was devastating to the cloth towns of the

County of Flanders The County of Flanders was a historic territory in the Low Countries. From 862 onwards, the counts of Flanders were among the original twelve peers of the Kingdom of France. For centuries, their estates around the cities of Ghent, Bruges and Ypr ...

, which had come to rely on English wool. Under the terms of the treaty a joint committee of four Flemish and four English merchants chaired by two English administrators was established to inquire into the financial losses on either side and report by Easter 1275. Whichever side had suffered the least was to reimburse the differenceC. Wyffels, "Economische oorlog tussen Vlaanderen en Engeland", in ''Doorheen de nationale geschiedenis'' (State Archives in Belgium, Brussels, 1980), pp. 54-56.

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