Slavery made them rich.
I ended SLAVERY.
Game of Thrones Season 5, Episode 1
Because if Meereen succeeds,
a city without SLAVERY,
Game of Thrones Season 6, Episode 9
"An examination of the economic,
cultural and political roots of SLAVERY...
The Big Bang Theory Season 6, Episode 6
"Slavery."
The Big Bang Theory Season 6, Episode 6
I sold men into SLAVERY, Khaleesi.
Game of Thrones Season 4, Episode 7