It was 'noble' of her to come forward with this information.
She married a man of 'noble' [='aristocratic'] birth/rank.
a 'noble' ideal/ambition/cause/purpose
(..) And if his mother... so much as looks at me... in a manner that displeases me, he will die. If she decides... to be noble... and takes her own life, he will die. And as for you, you will love me... as I loved you. (..)2000 Gladiator
(..) This man wants what you want. Then have him kill Commodus! I knew a man once, a noble man, a man of principle... who loved my father. And my father loved him. (..)2000 Gladiator