of India, including the use of the zero. In Europe, it
became known as the Arabic system. Al-Khwarizmi (al-
KHWAR-iz-mee), a ninth-century Iranian mathemati-
cian, developed the mathematical discipline of algebra.
In astronomy, the Muslims were aware that the earth
was round, and they set up an observatory at Baghdad
to study the stars, many of which they named. They
also perfected the astrolabe, an instrument used by sai-
lors to determine their location by observing the posi-
tions of heavenly bodies. It was the astrolabe that
made it possible for Europeans to sail to the Americas.
Muslim scholars also made discoveries in chemistry
and developed medicine as a field of scientific study.
Especially renowned was Ibn Sina (ib-un SEE-nuh)
(980–1037), known as Avicenna (av-i-SENN-uh) in the
West, who wrote a medical encyclopedia that, among
other things, stressed the contagious nature of certain
diseases and showed how they could be spread by con-
taminated water supplies. Avicenna was but one of
many Arabic scholars whose work was translated into
Latin and helped the development of intellectual life in
Europe in the twelfth and thirteenth centuries.
Chapter Summary
At the endof the eighth century, a new kingdom—the Carolin-
gian Empire—came to control much of western and central
Europe, especially during the reign of Charlemagne. The corona-
tion of Charlemagne, descendant of a Germanic tribe converted
to Christianity, as emperor of the Romans in 800 symbolized
the fusion of the three chief components of a new European civ-
ilization: the German tribes, the classical tradition, and Christi-
anity. In the long run, the creation of
a Western empire fostered the idea
of a distinct European identity and
marked a shift of power from the
south to the north. Italy and the Med-
iterranean had been the center of the
Roman Empire. The lands north of the
Alps now became the political center
of Europe, and increasingly, Europe
emerged as the focus and center of
Western civilization.
The Carolingian Empire was well governed but was held to-
gether primarily by personal loyalty to a strong king. The econ-
omy of the eighth and ninth centuries was based almost entirely
on farming, which proved inadequate to maintain a large mo-
narchical system. As a result, a new political and military order,
known as fief-holding, evolved to become an integral part of
the political world of the Middle Ages. Fief-holding was char-
acterized by a decentralization of political power, in which
lords exercised legal, administrative, and military power. This
transferred public power into many private hands and seemed
to provide the security sorely lacking
in a time of weak central government
and invasions by Muslims, Magyars,
and Vikings. In eastern Europe, the
Slavic kingdoms of Poland and Bohe-
mia were established; their peoples
were converted to Christianity by Cath-
olic missionaries, while the eastern
and southern Slavs adopted Orthodox
Christianity.
While Europe struggled, the Byzantine and Islamic worlds
continued to prosper and flourish. The tenth century was the
golden age of Byzantine civilization. Under the Macedonian
dynasty, trade flourished, the Bulgars were defeated, Muslim
armies were repelled, and Byzantine territory was increased.
The Umayyad Dynasty of caliphs had established Damascus as
the center of an Islamic empire created by Arab expansion in
the seventh and eighth centuries. In the eighth century, the new
Abbasid Dynasty moved the capital east to Baghdad, where Per-
sian influence was more pronounced. Greek and Persian scien-
tific and philosophical writings were translated into Arabic, and
the Muslims created a brilliant urban culture.
The brilliance of the urban cultures of both the Byzantine
Empire and the Islamic world stood in marked contrast to the
underdeveloped rural world of Europe. By 1000, however, that
rural world had not only recovered but was beginning to expand
in ways undreamed of by previous generations. Europe stood
poised for a giant leap.
Chapter Summary • 195
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