Kaiserslautern is a city in southwest Germany, located in the Bundesland of Rhineland-Palatinate at the edge of the Palatinate Forest. The historic centre dates to the 9th century. It is from Paris, from Frankfurt am Main, and from Luxembourg. Kaiserslautern is home to 100,569 people. Additionally, approximately 45,000 NATO military personnel inhabit the city and its surrounding district, and contribute approximately US$1 billion annually to the local economy. The city is also home to football club 1. FC Kaiserslautern that has won the German championship four times.