Example image of eyePlorer eyePlorer map for '840s': 841 Dublin Ireland Viking Battle of Fontenay (841) Carolingian Empire Charles the Bald Lothair I Louis the German 842 Oaths of Strasbourg 845 France West Francia Lothair II of Lotharingia Louis the Pious Treaty of Verdun Frisia Germany Netherlands 880 Taranto 844 Abdullah ibn Muhammad al-Umawi Judith of Flanders Charles of Provence 846 Hasan al-Askari Louis the Stammerer 847 Alfred the Great 848 Charles the Child Wang Jian (Former Shu) 849 Carloman, son of Charles the Bald 840 Emperor Wenzong of Tang Li Ao (philosopher) Alfonso II of Asturias Theophilos (emperor) Michael I Rangabe Pope Gregory IV Emperor Wuzong of Tang Pope Sergius II Feidlimid mac Cremthanin Walafrid Strabo Ermentrude of Orléans 9th century in architecture