Asia
The coastal periphery was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia, the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel. Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands.
History of Western civilization before AD 500
Ancient Rome was a civilization that grew out of a small agricultural community, founded on the River Tiber, on the Italian Peninsula as early as the 10th century BC. Located along the Mediterranean Sea, and centered at the city of Rome, the Roman Empire became one of the largest empires in the ancient world. In its centuries of existence, Roman civilization shifted from a monarchy to an oligarchic republic to an increasingly autocratic empire. It came to dominate South-Western Europe, South-Eastern Europe/the Balkans and the Mediterranean region through conquest and assimilation.
Originally ruled by Kings who ruled the settlement and a small area of land nearby, the Romans established a republic in 509BC that would last for five centuries. Initially a small number of families shared power, later representative assemblies and elected leaders ruled. Rome remained a minor power on the Italian peninsula, but found a talent for producing soldiers and sailors and, after subduing the Sabines, Etruscans and Piceni began to challenge the power Carthage. By 240BC, Rome controlled the formerly Greek controlled island of Sicily. Following the 207BC defeat of the bold Carthaginian general Hannibal, who had led an army spearheaded by war elephants over the Alps into Italy, the Romans were able to expand their overseas empire into North Africa. Roman engineers built arterial roads throughout their empire, beginning with the Appian Way through Italy in 312BC. Along such roads marched soldiers, merchants, slaves and citizens to all corners of a flourishing mercantile empire. Roman engineering was so formidable that roads, bridges and aqueducts survive in impressive scale and quantity to the present day. According to the historian Geoffrey Blainey, the population of the Imperial capital was probably the first in the world to approach one million people. It eventually consisted of monumental public buildings, such as the Colosseum (dedicated to sport), the bathhouses (dedicated to leisure) and the Roman Forum dedicated to civic affairs. Slavery helped power the economy, but also created occasional tension — as in the slave rebellion led by Spartacus which was put down in 71BC.
Julius Caesar (100BC-44BC) was a Roman general and statesman who played a critical role in the gradual transformation of the Roman Republic into the Roman Empire. Conspirators who feared he was seeking to re-establish a monarchy assassinated him on the floor of the Roman Senate in 44BC. His anointed successor Augustus Caesar outmaneuvered his opponents to reign as a de facto emperor from 27BC. His successors became all-powerful and demanded veneration as gods. Rome entered its period of Imperial rule and stability (albeit often marred by occasional bouts of apparent insanity by various god-emperors) returned to the Empire.