"Gulik" redirects here. For the surname, see Gulik (surname).
Map of Duchy of Julich.
The Jülich-Berg or sometimes the Duchy of Jülich (German: Herzogtum Jülich; Dutch: Gulik) was a state enlarged from the County of Jülich and became a duchy when combined with the County of Berg in the Holy Roman Empire, so that the territories are situated in present day Germany (part of North Rhine-Westphalia) and the Netherlands (part of Limburg). Its territory was situated on both sides of the river Rur, around its capital Jülich in the lower end of the Rhine drainage basin. It was combined with County of Berg in 1423.
When the last duke of Jülich-Cleves-Berg died issueless in 1609, a war broke out for the succession. The duchies were divided between Palatinate-Neuburg (Jülich and Berg) and Margraviate of Brandenburg (Cleves and Mark) in the Treaty of Xanten of 1614. When the last duke of Palatinate-Neuburg (after 1685 also Palatine Elector) died issueless in 1742, Jülich and Berg were inherited by the Duke of Palatinate-Sulzbach (after 1777 also Duke of Bavaria).