Two very last doubts. Do you say "the Augustan or The Augustans were interested in real life".

He admitted it had been him who ate all the cake./He admitted eating all the cake. Are they both correct?

Do you say "the Augustan or The Augustans were interested in real life".

I'd use "The Augustans..."

He admitted it had been he who ate all the cake./He admitted eating all the cake. Are they both correct?
Both are correct now! But I wouldn't use the first one -- almost no one speaks that way.