Kreuzlingen  Kreuzlingen is a municipality in the district of Kreuzlingen in the canton of Thurgau in north-eastern Switzerland. It is the seat of the district and is the second-largest city of the canton, after Frauenfeld, with a population of about 22,000. Together with the adjoining city of Konstanz just across the border in Germany, Kreuzlingen is part of the largest conurbation on Lake Constance with a population of almost 120,000. The name of the municipality stems from the Augustinian monastery "Crucelin", later Kreuzlingen Abbey. It was founded in 1125 by the Bishop of Constance Ulrich I. In the Swabian War and the 30 Years' War after the siege of Constance by Swedish troops, the Augustinian monastery was burned down by the people of Constance, who blamed the monks for having supported the enemy. In 1650, the monastery was rebuilt in its present location. With secularization in 1848, the buildings became a teachers' school. The chapel became a Catholic church The area was already settled during the Bronze Age. Celtic and Roman coins and artifacts testify of continued settlement. Kurzrickenbach is first mentioned as "Rihinbah" in 830, Egelshofen as "Eigolteshoven" in 1125, and Emmishofen as "Eminshoven" in 1159. The territory of the municipality, except for the Augustinian monastery, belonged to the Bishop of Constance. When the "Eidgenossen" conquered Thurgau in 1460 and further with the Reformation, the ties to the neighboring city loosened. Until the beginning of the 19th century, the present center of Kreuzlingen was still largely agricultural. The first steamboats began to operate on Lake Constance in 1824. The first train line to Romanshorn was finished in 1871, and the second to Etzwilen in 1875. This brought commerce and industry to the region. In 1874, the municipality of Egelshofen was renamed "Kreuzlingen" and became the capital of the district, instead of Gottlieben. It reached its present size with the incorporation of Kurzrickenbach in 1927 and Emmishofen in 1928. However, until World War I, Kreuzlingen was a kind of suburb of Constance. Most of its industry was in the hands of German firms.