Italy (which covered the northern half of the Italian Peninsula). He also received the two imperial cities, Aachen and Rome. Louis II received Francia Orientalis (the East Frankish kingdom). He was guaranteed the kingship of all lands to the east of the Rhine (although not the Netherlands to the north of the Rhine) and to the north and east of Italy, altogether called East Francia. It eventually became the High Medieval Kingdom of Germany, the largest component of the Holy Roman Empire. Charles II received Francia Occidentalis (the West Frankish kingdom). Pepin II was granted the Kingdom of Aquitaine, but only under the authority of Charles. Charles received all lands west of the Rhône, called West Francia. It eventually became the Kingdom of France. After Lothair's death in 855, his eldest son, Louis II, inherited Italy and his father's claim to the Imperial throne. Upper Burgundy and Lower Burgundy (Arles and Provence) passed to Lothair's third son, Charles of Provence. The remaining territory north of the Alps, which did not previously have a name, was inherited by Lothair's second son, Lothair II, and was then named Lotharingia (present day Lorraine) after him. Legacy The division reflected an adherence to the old Frankish custom of partible or divisible inheritance amongst a ruler's sons, rather than primogeniture (i.e., inheritance by the eldest son) which would soon be adopted by both Frankish kingdoms. Since Lotharingia combined lengthy and vulnerable land borders with poor internal communications as it was severed by the Alps, it was not a viable entity and soon fragmented. This made it difficult for a single ruler to reassemble Charlemagne's empire. Only Charles the Fat achieved this briefly. In 855, the northern section became fragile Lotharingia, which became disputed by the more powerful states that evolved out of Francia Occidentalis (present day France) and Francia Orientalis (present day Germany). Generations of kings of France and Germany were unable to establish a firm rule over Lothair's kingdom. While the north of Lotharingia was then composed of independent countries, the southern third of Lotharingia, Alsace-Lorraine, was traded back and forth between France and Germany from the 18th to the 20th century. In 1766, it passed to France after the death of Stanisław Leszczyński, who had acquired the region from the German Habsburgs by the Treaty of Vienna (1738) ending the War of Polish Succession (1733–1738). In 1871, Alsace-Lorraine became German, after the victory