Jaime charges Briane to search for Sansa giving her one of the two valyrian steel swords made from Ice which he asks her to name oathkeeper.
“Nor I. There was a time that I would have given my right hand to wield a sword like that. Now it appears I have, so the blade is wasted on me. Take it.” Before she could think to refuse, he went on. “A sword so fine must bear a name. It would please me if you would call this one Oathkeeper. One more thing. The blade comes with a price.” Jaime pg 1008
