Slavery made them rich.
I ended SLAVERY.
Game of Thrones Season 5, Episode 1
You were sold into SLAVERY,
Game of Thrones Season 5, Episode 1
Queen Daenerys has outlawed SLAVERY.
Game of Thrones Season 5, Episode 6
You'd rather be sold into SLAVERY?
Game of Thrones Season 6, Episode 4
They do not ask for the return of SLAVERY.
Game of Thrones Season 5, Episode 1