Bauer (The History of the Ancient World) continues her witty and well- written examination of world history with a volume that is rich in detail and intriguing in anecdotal information. In describing dramatic events (such as the worldwide #impact of the eruption of Krakatoa in 535 C.E., or civil war among the descendants of Charlemagne), near-legendary individuals (like the great general turned mercenary El Cid), and decisive historical movements from the fourth century C.E. to the beginnings of the 12th century, attention is effectively paid not only to western and eastern Europe but to North Africa, the Middle East, Central Asia, the Far East, South Asia, and the Americas. The political and military rise and fall of rulers or would-be rulers and the prominence of religion in matters of conscience and state give force and power to the narrative as does the constant impact of simple human emotion and ambition on the flow of history. A bit overwhelming in its scope, Bauer#s work nevertheless proves perfectly, and entertainingly, that the 'more things change, the more they stay the same.' 20 illus., 85 maps. (Feb.)