What is a question about this article? If the question is unanswerable, say "unanswerable".

During this period Boston flourished culturally as well, admired for its rarefied literary life and generous artistic patronage, with members of old Boston families—eventually dubbed Boston Brahmins—coming to be regarded as the nation's social and cultural elites.

Who came to be known as the nation's social elites?
Boston Brahmins