JÜLICH (Fr. _Juliers_), a town of Germany, in the Prussian Rhine province, on the right bank of the Roer, 16 m. N.E. of Aix-la-Chapelle. Pop. (1900), 5459. It contains an Evangelical and two Roman Catholic churches, a gymnasium, a school for non-commissioned officers, which occupies the former ducal palace, and a museum of local antiquities. Its manufactures include sugar, leather and paper. Jülich (formerly also Gülch, Guliche) the capital of the former duchy of that name, is the Juliacum of the _Antonini Itinerarium_; some have attributed its origin to Julius Caesar. It became a fortress in the 17th century, and was captured by the archduke Leopold in 1609, by the Dutch under Maurice of Orange in 1610, and by the Spaniards in 1622. In 1794 it was taken by the French, who held it until the peace of Paris in 1814. Till 1860, when its works were demolished, Jülich ranked as a fortress of the second class. JÜLICH, or JULIERS, DUCHY OF. In the 9th century a certain Matfried was count of Jülich (pagus Juliacensis), and towards the end of the 11th century one Gerhard held this dignity. This Gerhard founded a family of hereditary counts, who held Jülich as immediate vassals of the emperor, and in 1356 the county was raised to the rank of a duchy. The older and reigning branch of the family died in 1423, when Jülich passed to Adolph, duke of Berg (d. 1437), who belonged to a younger branch, and who had obtained Berg by virtue of the marriage of one of his ancestors. Nearly a century later Mary (d. 1543) the heiress of these two duchies, married John, the heir of the duchy of Cleves, and in 1521 the three duchies, Jülich, Berg and Cleves, together with the counties of Ravensberg and La Marck, were united under John's sway. John died in 1539 and was succeeded by his son William who reigned until 1592.