Aigle is the first French-speaking Reformed territory of the German-speaking Swiss Confederation (only the Catholic Fribourg was also Fribourg). Aigle first appeared in a document around 1140. This document refers to the Priory of St. Maurice of Aigle, founded by the Abbey of Agaune (St. Maurice).

The monastery in Aigle no longer exists, as it was dissolved during the Reformation (1526-1528). The former monastery chapel became the parish church in 1528. The first church was built during the Burgundian period in the 6th century.

The Romanesque church dates from the 11th or 12th century. At the end of the 15th century, the vault and choir were renovated in Gothic style. This former monastery church, with its mixture of Romanesque and Gothic styles, is a monument protected by the Swiss Confederation.

In 1476, Aigle became the first French-speaking territory of the German-speaking Swiss Confederation when Fribourg ceded its dominion over Aigle to the Republic of Bern.

St. Jacques Church, the Deutsche Evangelische Kirche nowadays 

The dominion of Aigle, consisting of the regions of Aigle, Ollon, Bex, and Les Ormonts, was also the first bastion of the Reformation in French-speaking Switzerland! The reformer Guillaume Farel (1489-1565) preached for the first time in French-speaking Switzerland at the Church of St. Jacques on 30 November 1526.

Aigle is therefore not only the first French-speaking town on the territory of the German-speaking Swiss Confederation, but also the first Reformed town in French-speaking Switzerland, ahead of Neuchâtel (1530), Lausanne (1536), and Geneva (1536).