Slavery, or involuntary subjection to another or others, existed in every ancient civilization, such as Sumer, Ancient Egypt, Ancient Greece, parts of the Roman Empire, and so on. People were enslaved for various reasons, including slave raiding, sale of insolvent debtors and capture in war; slaves commonly were recognized as property, assets that could be bought and sold. In the Chinese empire (c. 211 BCE - 1912 CE), slavery existed throughout all dynasties, although numerous aspects of slavery did not remain the same. The word "slave" itself changed many times, nubi () in the Han period, yinke () in Jin, booi aha () under Manchu rule, and so on. The function and position of slaves in Chinese economy shifted several times as well.             This paper will briefly describe the initiation of slavery before Imperial China, and proceed to analyze several aspects about slavery in each dynasty of the Chinese Empire; I will discuss the changing definition of a slave, how slaves became slaves, abolition of slavery and ways to gain freedom, and the degree of dependence or power slaves held in society. The paper is organized in chronological order, but details of slavery in several dynasties existing before Ming and Qing can be scarce due to the lack of attention slaves received prior to Manchu rule.

Slavery in ancient Rome was vital the economy and the social fabric of the society. The slave population has been estimated at anywhere from 25 to "40%" of the population of the city as a whole - 350,000 of the 900,000 total inhabitants.

The Pyramids, the development of tools to ensure a level base and the development of mortar and cement

Having set the background and gained a glimpse of just how thorny the subject could be it seems easiest to change tack and take the loosest of definitions. Listing some of the many things for which Ancient Rome might justly be remembered for....in no particular order: Advanced roads and road networks Milestones The standard width of our modern roads and tunnels is based on that of ancient Rome (there was a standard width for cart wheels, essentially based on the need of placing two horses side by side). The worn ruts in the roads made it virtually impossible to use any other measure. Triumphal arches Aqueducts (actually they learned much about structures from the Estruscans, but developed it to perfection) Bronze valves and water pumps. Huge numbers of instruments and tools for engineering, construction and measurement. The Romans were, after all, excellent engineers. For example you could purchase your access to water supply for set hours of the day or set quantities of water, which were dutifully metered and billed, pretty much as you would today, albeit with slighty different technology!. Medical and Surgical tools (mainly thanks to the Greeks actually but hugely developed as a consequence of the needs generated by Gladiatorial games and continuous war campaigns) Cesareans - sounds like Caesar doesn't it? Cesareans were often used to save the baby if the mother died during childbirth. Fast curing cement - hugely important discovery which allowed cement to cure and harden in short times and even under water. The ancient Romans realised that adding pozzolanic earth from volcanic regions (Eg Pozzuoli near Naples) to traditional mortar allowed a water proof and extremely solid mix. This could be used to waterproof the interior of aqueduct tunnels or extend the potentials of Roman architecture with impo

There were three political bodies where citizens gathered in numbers running into the hundreds or thousands. These are the assembly (in some cases with a quorum of 6000), the council of 500 (boule) and the courts (a minimum of 200 people, but running at least on some occasions up to 6000). Of these three bodies it is the assembly and the courts that were the true sites of power — although courts, unlike the assembly, were never simply called the demos (the People) as they were manned by a subset of the citizen body, those over thirty.