assoluta

The signora is my second wife; she is prima donna assoluta of the grand opera, Naples.

Ibid.: 'L'autorit del quale cosi assoluta, che con verit si puo dire essere egli il re e governatore di quella monarchia'

He, Mr. Churchill, and Mr. Lloyd George might almost have been called rivals for the rle of prima ballerina assoluta.

Storace, the prima donna assoluta of the King's Theatre, would not accompany the other singers to Paris.

Thus, for twelve years the Baroness had filled the part in her household of prima donna assoluta, without a rival.