The establishment of the Teutonic Order at the confluence of the Rhine and Moselle in 1216 gave this historic site its name, the “Deutsches Eck” (“German Corner”). Koblenz also owes its name to the meeting point of the Rhine and the Moselle - from “Castellum apud Confluentes”, Latin for “fort at the confluence”, which over time became the current name of Koblenz. http://www.koblenz-tourism.com/culture/koblenz-attractions/deutsches-eck.html