Rendsburg 's a town on the Kiel Canal in the northeastern part of Schleswig-Holstein, Germany. It's the capital of the Kreis (district) of Rendsburg-Eckernförde. As of 2006, it'd a population of 28,476. History Rendsburg's foundation date's unknown. Rendsburg was first mentioned in 1199. An old form of its name was Reynoldsburgh. It became a part of Holstein in the 13th century, but was transferred to Schleswig in 1460. Many times the town passed from Danish to German control and vice ver… (More on Rendsburg)