Troisdorf is a city in the Rhein-Sieg-Kreis, in North Rhine-Westphalia, Germany. Troisdorf is located approximately 22 kilometers south of C…Troisdorf is a city in the Rhein-Sieg-Kreis, in North Rhine-Westphalia, Germany. Troisdorf is located approximately 22 kilometers south of Cologne and 13 kilometers north east of Bonn. Troisdorf became a free city in 1952. In 1969, the urban area expanded with the annexation of the township of Sieglar and the villages of Altenrath and Friedrich-Wilhelms-Hütte. The first large settlements in this area go back to the 9th and 10th century. The first churches in this area were built around 700 AD in Bergheim.
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