Cleese is absolutely right.
The Roman Empire brought in almost 500,000 slaves a year because they worked them to death, so they ran out quickly.
Most of those slaves came from Britannia and Gaul.
The numbers were enormous.
or you could fight in the roman army like the gladiator
Sounds like the Middle East and Arabian countries. They imported tens of thousands of black slaves from African slave dealers.
They have no problems today with descendants of those slaves raising hell because back then they castrated all the males.