The Franciscan monastery in Heilbronn was a monastic community that had existed since the 13th century. The monastery was abolished in 1544. Parts of the monastery building were demolished in 1925 and the remains were destroyed in 1944. The monastery church of St. Mary and Francis, consecrated in 1314, was destroyed in 1688; the tower of the church, which was rebuilt in 1727, is now known as the Hafenmarktturm.
The city of Heilbronn used the monastery as the new home of the Latin school after 1544, and in 1566 the provincial superior of the Franciscan order formally left the former monastery complex to the city. In 1575 the cloister and convent served as the council library. Until after the Karlsgymnasium for boys was built in 1827, some classes continued to be taught in the former monastery. In the 19th century, a total of four major additions and renovations were carried out on the building, which temporarily housed several schools, including the girls' high school and, until 1889, the Heilbronn trade school. In 1925, the cloister of the monastery was demolished when the inner courtyard was roofed (for use as a gymnasium). The monastery building was completely destroyed in the major air raid on Heilbronn in 1944.
Source: Wikipedia