Slavery from 509 B.C. till 476 A.D.

In the Roman Republic, slaves had to work on plantations. That made large plantations profitable.
For this reason, the Roman Republic became a slave- based society.
Many years later, the Roman Empire was built. But not by the population but rather by the slaves.
Millions of kidnapped victims or war captives were enslaved, so the slave numbers outnumbered free people three times.
The slaves had no rights, They were not protected by any lawas. (You cannot say 'to use the law' ) to use any law. Their only chance was to pay for their freedom and then live as a free man or woman.
Often, when the slaves outnumbered their owners, they revolted.
Therefore we know the most famous revolt, which was led by Spartacus.
He had 90.000 soldiers, but was killed in a battle with many of his combatants.