He-man
Hero extraordinary
Slavery has existed in every culture up until present. It's had various names, like slavery, serfdom, caste and others.
It wasn't until Western European civilization, specifically British and American political philosophy as of the 1800's, that people started thinking it was something to abolish.
Not entirely true, I find it hard to compare serfs to slaves for serfs would often have legal rights that slaves would not have and could more often then not be traded away, anyhow the idea to abolish slavery started way earlier then the 18th century Anglo Saxon realms. In medieval Europe it was considered an ill thing to own Christian slaves(among Christians of course, pagans wouldn't care a lot for the poor Christians) and the Catholic church would press on the Royals of the lands to abolish slavery - yes in fact it was replaced with serfdom(some time over time as the nobles would force the newly freed men into economic hardship) but I don't think that could be compared much with the American slavery Africans enjoyed in the Americas.
What little I remember of the Indian caste system(I assume that is what you meant) it could not be considered slavery either, all men, even "free men" have been bound by law and tradition by one mean or the other, and still is in many parts of the world - just because you are born into a low caste does not mean you can be bartered with or have no legal rights, or can be considered property of an owner.
