according to the highest authority

Moreover, it was heretical according to the highest authority.

"Titus Andronicus" is a "tragedy of blood" written by Shakspere, according to the highest authority, when he was twenty-three or twenty-four years of age.

Had Bright said that the French, Spaniards, Germans, or Russians were a nation of brutes and ought to be exterminated, no one would have found fault; the whole human race, according to the highest authority, has been exterminated once already for the same reason, and only the rainbow protects them from a repetition of it.