The Duchy of Lower Lorraine or Lower Lotharingia (also referred to sometimes as Lothier or Lottier in titles), established in 959 was a stem duchy of the medieval Kingdom of Germany, which encompassed almost all of the modern-day Netherlands (including Friesland), mid and eastern Belgium, Luxemburg, the northern part of the German Rhineland province and the eastern parts of France's Nord Pas De Calais region.