The history of the church goes back to the 15th century, when a small church was built which is now the chancel of the current church. In 1420, a monastery was built next to the church. During the Reformation, it was taken over by Protestants who converted it into a warehouse and a hospital. The church itself was left in the care of the Franciscan order, but it eventually fell into ruin. The 17th-century records describe a decrepit church with only the altar depicting the Assumption of Mary intact. The Franciscans did not start the renovation until 1671; four years later, the church received a new invocation: St Peter of Alcantara. The renovation works changed the architectural style of the interior of the church to Baroque. At the beginning of the 19th century, the church was secularized and turned into a military warehouse. In 1825, the church was purchased by the town of Namysłów and continued to serve as a warehouse. During that period, the windows were partially walled-up. In 1982, the ruined building was handed back to the Church. Six years later, the church was consecrated and in 1992 the Metropolitan of Breslau founded the parish of St Francis of Assisi and St Peter of Alcantara.