JULIERS, a duchy in the circle of Westphalia, in Germany, seated between the rivers Maese and Rhine, now forming part of the Prussian province of the Lower Rhine. It is about 60 miles long, and 30 broad; has a superficial extent of 1600 square miles, with 200,000 inhabitants, and is a very plentiful country, abounding in cattle, corn, and fine meadows, and is well supplied with wood; but it is most remarkable for a fine breed of horses, and wood for dyeing, which is gathered here in abundance. The chief towns are Juliers, Aix-la-Chapelle, Duren, Munster-Eifel, Bedbur, Wefinburgh, and Lasteren. It was transferred from France to Prussia in 1815.