The death of Charlemagne's son Louis the Pious and the following partition of the Frankish Empire in the 843 Treaty of Verdun marked the end of a single state. While the population in both the Western and Eastern kingdoms had relative homogeneous language groups (Gallo-Romanic in West Francia, and Low German and High German in East Francia), Middle Francia was a mere strip of a mostly blurring yet culturally rich language-border-area, roughly between the rivers Meuse and Rhine – and soon partitioned again. After the 880 Treaty of Ribemont, the border between the western and eastern kingdoms remained almost unchanged for some 600 years. Germany went on with a centuries-long attachment with Italy, while France grew into deeper relations with England.