Irene of Athens, Byzantine empress (797-802). She served (780-90) as regent for her son, Constantine VI, and later was made (792) joint ruler. Devoted to the Orthodox Church, she bent most of her efforts to suppressing iconoclasm. In 797 Ir...

Offa (son of Thingfrith, son of Eanulf), King of Mercia, was one of the leading figures of Saxon history. He obtained the throne of Mercia in 757, after the murder of his cousin, King Aethelbald, by Beornraed. After spending fourteen years...

Jayavarman II, a 9th century king of Cambodia, is widely recognized as the founder of the Khmer Empire, which ruled much of the Southeast Asian mainland for more than six hundred years. Historians formerly dated his reign as running from 80...

Bai Juyi or Po Chü-i was a Chinese poet of the Tang dynasty. He wrote over 2,800 poems, which he had copied and distributed to ensure their survival. He is most notable for the accessibility of his work. It is said that he rewrote any part...

Liu Zongyuan was a Chinese writer and poet who lived in Chang'an in the Tang dynasty. Along with Han Yu, he was a founder of the Classical Prose Movement. He was traditionally classed as one of the Eight Great Prose Masters of the Tang and...

Roland, the great French hero of the medieval Charlemagne cycle of chansons de geste, immortalized in the Chanson de Roland (11th or 12th cent.). Existence of an early Roland poem is indicated by the historian Wace's statement that Taillefe...

Louis the Pious, also called the Fair, and the Debonaire, was the King of the Franks and co-Emperor (as Louis I) with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only surviving adult son of Charlemag...

Al-Khwarizmi was a Persian scholar who produced works in mathematics, astronomy, and geography. Around 820 AD he was appointed as the astronomer and head of the library of the House of Wisdom in Baghdad. Al-Khwarizmi's popularizing treat...

The Viking Age is the period from 793 AD to 1066 AD in European history, especially Northern European and Scandinavian history, following the Germanic Iron Age. It is the period of history when Scandinavian Norsemen explored Europe by its s...

Leo III, Saint, pope (795–816), a Roman; successor of Adrian I. He was attacked about the face and eyes by members of Adrian's family, who hoped to render him unfit for the papacy. Leo recovered and fled (799) to Charlemagne's protection at...

Gunpowder, also known as the retronym black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur (S), charcoal (C), and potassium nitrate (saltpeter, KNO3). The...

The Book of Kells (Irish: Leabhar Cheanannais), sometimes known as the Book of Columba, is an illuminated manuscript in Latin, containing the four Gospels of the New Testament together with various prefatory texts and tables. It was transcr...

The Dresden Codex is a pre-Columbian Maya book of the eleventh or twelfth century of the Yucatecan Maya in Chichén Itzá. The Maya codex is believed to be a copy of an original text of some three or four hundred years earlier. Historians sa...

Angkor is a name conventionally applied to the region of Cambodia serving as the seat of the Khmer empire that flourished from approximately the ninth century to the fifteenth century A.D. More precisely, the Angkorian period may be defined...

Basil I, called the Macedonian was a Byzantine Emperor who reigned from 867 to 886. Born a simple peasant in the theme of Macedonia, he rose in the Imperial court. He entered into the service of Theophilitzes, a relative of Emperor Michael...