Munster has gradually formed around the monastery founded at the confluence of two Fecht under Childeric II to 660 by Benedictine monks Irish disciples of Pope St. Gregory the Great. This facility is at the origin of the Benedictine abbey is first called Monasteriolo Confluentis to 673, which takes its name Munster.
In a charter dated March 4 673, King Childeric II confirms the Duke Adalric and Robert Earl that he gave to the abbot Valedius and monastery land and property located in the lowlands to Ohnenheim and Muntzenheim.
In 747, the monastery is named after Monasterio Sancti Gregorii, former name of Val Saint-Gregoire to the valley. Thereafter, who settled in villages near the city formed with "The Community of Val St. Gregory, which persisted until the Revolution.
The king of Germany, Otto I Grand restores the empire of Charlemagne in 962 and founded the Holy Roman Empire which will be part Munster until the seventeenth century. Munster is ruined by a fire May 4, 1182.

In 1235, Father abandons its rights of jurisdiction to the Emperor Frederick II of Hohenstaufen, who will convey these rights to the inhabitants of the valley. Munster becomes imperial city with immediacy Empire.
1287 is the year of confirmation of the existence of the Community of Val St Gregory which includes Munster and nine towns in the valley. The community now has its seal 'S. Communitatis Vallis Sancti Gregorii. " The city is surrounded by bulwark in 1308.
The Marquart treaty signed between the city and the abbey in 1339 lists in detail all the rights of the abbot and therefore all easements which were subject the people of Val-Saint Gregory.
In 1349, the bubonic plague ravaged half the population of the valley.
According to the foundation of King Charles IV of 28 August 1354 the league was founded ten cities including free Alsatian Munster, the Decapolis, which engages these cities to provide assistance in case of conflict.
Half the city is destroyed by fire in 1466.

In 1648, the valley is totally devastated and the abbey is in ruins, the city fell under the sovereignty of the French crown. Some regiments Lorraine sow still desolation in the valley of Munster in 1652.
The eighteenth century was marked by serious conflicts between Munstériens and royal authority. The appointment in 1736, a royal Lender, which has the power and who may oppose the decisions of the Community Council causes stir in the valley.

After the revolution of 1789, which saw the headquarters of the Hotel de Ville, the ten common undivided were erected to separate municipalities, each with its mayor and city council, the mayor of Munster as president. But the communal property, which formed the common heritage, remained undivided. This organization exceptional and unique in its kind, recalling the creation of a federal republic, lasted until 1847.
The abbey is closing its doors in 1791 and then sold as a national asset. Munster became the chief town of Canton in 1793.

The nineteenth century was one of industrialization, modernization and openness of the valley to the outside, under the initiative, including the family Hartmann, industrialists, and political patrons.
Following the defeat of Napoleon I, the valley has two occupations in 1814 that troops in Bavaria, in 1815 that Austrian troops and Baden.
The appearance of the city will profoundly transform itself during the nineteenth century with the construction of factories, taxiways (including railways), public facilities (schools, hospitals…) and cited workers.
The Hartmann manufactures employ 90% of the workforce textile valley and occupy 3,144 employees in 1841. The Hartmann family pays for its schools the strongest patent Upper Rhine, made the largest profits and the largest turnover in the department.

During the Franco-Prussian war of 1870/1871, there is no military operation in the valley, apart from a few battles between German troops and snipers in the valley. The Treaty of Frankfurt from May 10, 1871 sealed the annexation of the Alsace and part of Lorraine to the new German Empire. Munster becomes border town.
In 1905, the valley has 23 500 inhabitants, of whom 6 000 in Munster (3 810 in 1921) and 1907 saw the inauguration of electric tram Munster-Schlucht, which is between the rack and the hotel Saegmatt of Altenberg. It was the highest railway in the German empire. It stops working in September 1914.

The First World War represents a break in the history of the city and the valley (except Mittlach). From February 1915, Munster is bombarded daily and deadly battles succeed (March-April, fighting in Reichackerkopf; June 15, beginning the Battle of Metzeral; July 20 - October 15, 1915, battle of the machine. At the end of the war, the city is destroyed to 85%. From the day after the armistice of 1918, reconstruction is underway.

A major exhibition artisanal and commercial Munster mark the end of Reconstruction and the beginning of a new era. But during the economic crisis, the valley is badly affected by unemployment between 1931 and 1939.
The German army occupies Munster June 18, 1940. The occupation leads to a trail of misery and repression, with the incorporation of strength of Alsace in August 1942.
After bitter fighting for the seizure of Hohneck in December 1944, the city will be released on February 5, 1945.

In 1976, municipalities in the canton come together as a Syndicat Intercommunal to Vocations Multiples, twenty years later they decided to create a new structure for cooperation between the Commonwealth of Municipalities of the Valley of Munster. The first presidency of the council is assured by the mayor of Munster.