The County of Luxembourg was a historical territory in Europe that existed from the 10th century until the late 18th century. It was located in what is now modern-day Luxembourg, parts of Belgium, and France. The county played a significant role in the feudal system and was ruled by various noble families, contributing to its rich history. In 1815, the Congress of Vienna transformed the County of Luxembourg into a Grand Duchy, which is still recognized today as the Grand Duchy of Luxembourg. The region is known for its diverse culture, historical architecture, and beautiful landscapes, making it an important part of European heritage.