Which preposition to use with ennoblement

of Occurrences 6%

Symonds says of him: "It was he who irrevocably decided the destinies of the romantic drama; and the whole subsequent evolution of that species, including Shakespeare's work, can be regarded as the expansion, rectification, and artistic ennoblement of the type fixed by Marlowe's epoch-making tragedies.

in Occurrences 1%

Why, if Caesar had adopted you, would you not show your proud sense of ennoblement in haughty looks; how is it that you are not proud of being sons of God?

Which preposition to use with  ennoblement