Amasia was on the edge of the Roman empire, and when strabo was born around 64 B.C.
Answer:
approximately 14.6 million people
There was a series of laws and amendments passed to give them their rights, and example would be:
The right to vote
The destruction of man being enslaved do to color of skin
Etc.
But of course this stuff kept going until the late 1800`s, but finally died down
