a bitter 'custody battle' [=a legal fight between divorced parents about who will take care of a child]
He was taken 'into' (police) 'custody' last night and will be charged with murder today.
The witness is 'in protective custody'. [=is being kept in a safe place by the police]
(..) No, but if the king should call... The whole thing will be over before anyone can call on you to do anything. When the High Sparrow is in custody or dead, preferably, and Margaery's back at Tommen's side, do you think the king will be angry at the outcome? You hate these fanatics as much as we do. (..)2016 TvShow: Game of Thrones Title: Book of the Stranger Season: 6 Episode 4
(..) You've got the second largest army in Westeros. You'll bring them into the city, stop Queen Margaery's humiliation before it starts, and take her back into Crown custody. The king has ordered me to take no action against the High Sparrow or the Faith Militant out of fear for the queen's safety. (..)2016 TvShow: Game of Thrones Title: Book of the Stranger Season: 6 Episode 4