Magical powers were once thought to 'be attached to' the stone. [=the stone was once thought to have magical powers]
Little credibility 'was attached to' his story. [=people did not think that his story was very credible]
The shy child 'attached' herself 'to' her mother [=stayed close to her mother] during the whole party.
(..) _ _ _ _ Told you, I'm very attached to this knife. You all right? If they find a body with a stab wound, the whole city will be looking for us. _ _ (..)2016 TvShow: Game of Thrones Title: Book of the Stranger Season: 6 Episode 4
(..) hand over his teeth. There's of them down there. We can't fight our way out. We wait till dark, and then we'll find her. I'm very attached to this knife. Don't worry. It didn't touch you. You know what happens? I know what happens. I'll do it myself. I should have been born a Dothraki. (..)2016 TvShow: Game of Thrones Title: Book of the Stranger Season: 6 Episode 4