The lions were bred 'in captivity'. [=while living in a zoo]
The prisoners were released from 'captivity'.
(..) Daenerys is the dragon queen. Can't very well let the dragons starve, that's obvious. If a dragon does not want to eat, how do you force him to eat? Dragons do not do well in captivity. - How do you know this? - That's what I do. I drink and I know things. The dragons Aegon used to conquer Westeros (..)2016 TvShow: Game of Thrones Title: Home Season: 6 Episode 2