Events By Place Europe Tulga succeeds his father Suinthila as king of the Visigoths. The French city of Lille's founded by Lyderic. Africa July - The Battle of Heliopolis's fought between Arab Muslim armies and the Byzantine Empire. Asia Emperor Taizong's campaign against Xiyu states, or the Western Regions in the Tarim Basin, commences in this year, as the Tang Dynasty Chinese commander Hou Junji captures Gaochang to solidify Chinese rule in Central Asia. By Topic Religion May 28 R… (More on 640)