 However, modern historians believe that the etymology of the word "Luxembourg" is a derivation of the word "Letze", meaning fortification, which might have referred to either the remains of a Roman watchtower or to a primitive refuge of the Early Middle Ages.The first known reference to the territory was by Julius Caesar in his "Commentaries on the Gallic War"

The ruined, supposedly Roman, fortification called "Lucilinburhuc" was first mentioned in 963, when Count Siegfried acquired it from Wikerus, Abbot of St. Maximin's Abbey in Trier.Siegfried first appeared about 950.