メルセン条約
Lothair II ruled from Aachen and did not venture outside his kingdom. When he died in 869, Lothair II left no legitimate children, but one illegitimate son - Hugh, Duke of Alsace. His uncles, king of East Francia Louis the German and West Francia Charles the Bald (who wanted to rule the whole of Lotharingia) agreed to divide Lotharingia between them with the 870 Treaty of Meerssen - the western half went to West Francia and the eastern half to East Francia. Thus, Lotharingia, as a united kingdom, ceased to exist for some years. In 876, Charles the Bald invaded eastern Lotharingia with the intent to capture it, but was defeated near Andernach by Louis the German.