The Lower League was a union of the four imperial cities

Imperial City

-Places:* Imperial City, Beijing, the central section of Beijing* Imperial City , a walled fortress and palace in the former capital of Vietnam.* Free imperial city, city formally responsible only to the emperor in the Holy Roman Empire,....

 Strasbourg

Strasbourg

Strasbourg is the capital and principal city of the Alsace region in eastern France and is the official seat of the European Parliament. Located close to the border with Germany, it is the capital of the Bas-Rhin département. The city and the region of Alsace are historically German-speaking,...

, Basel

Basel

Basel or Basle In the national languages of Switzerland the city is also known as Bâle , Basilea and Basilea is Switzerland's third most populous city with about 166,000 inhabitants. Located where the Swiss, French and German borders meet, Basel also has suburbs in France and Germany...

, Colmar

Colmar

Colmar is a commune in the Haut-Rhin department in Alsace in north-eastern France.It is the capital of the department. Colmar is also the seat of the highest jurisdiction in Alsace, the appellate court....

 and Schlettstadt, formed in 1473, joined by the bishops of Basel and Strasbourg, Sigismund of Habsburg and by the Old Swiss Confederacy

Old Swiss Confederacy

The Old Swiss Confederacy was the precursor of modern-day Switzerland....

 in 1474.

The name of the league is intended to distinguish it from the "upper" (highland) league of the Swiss Confederacy.
The league formed an anti-Burgundian pact, led by Strassbourg, Basel, Berne

Berne

The city of Bern or Berne is the Bundesstadt of Switzerland, and, with a population of , the fourth most populous city in Switzerland. The Bern agglomeration, which includes 43 municipalities, has a population of 349,000. The metropolitan area had a population of 660,000 in 2000...

 and Lucerne

Lucerne

Lucerne is a city in north-central Switzerland, in the German-speaking portion of that country. Lucerne is the capital of the Canton of Lucerne and the capital of the district of the same name. With a population of about 76,200 people, Lucerne is the most populous city in Central Switzerland, and...

, in April 1474.
This collaboration led contributed to the final defeat of Charles the Bold and the conclusion of the Burgundian Wars

Burgundian Wars

The Burgundian Wars were a conflict between the Dukes of Burgundy and the Kings of France, later involving the Old Swiss Confederacy, which would play a decisive role. Open war broke out in 1474, and in the following years the Duke of Burgundy, Charles the Bold, was defeated three times on the...

 at the Battle of Nancy

Battle of Nancy

The Battle of Nancy was the final and decisive battle of the Burgundian Wars, fought outside the walls of Nancy on 5 January 1477 between Charles the Bold, Duke of Burgundy, and René II, Duke of Lorraine...

 in 1477.

In the wake of the Burgundian Wars, Basel became a full member of the Swiss Confederacy, while collaboration between the Swiss and the cities of Strasbourg, Colmar and Schlettstadt would not be resumed.