While fans of Julian Fellowes’s Gilded Age may be gagging on the luxurious costumes and sumptuous sets, part of the fun is sorting out fact from fiction in the new HBO period drama. With a mix of invented characters and actual historical figures—such as society queen Caroline Astor, foppish Ward McAllister, African American newspaper editor and civil rights leader T. Thomas Fortune, and American Red Cross founder Clara Barton—enthusiasts have plenty of resources available so they can learn the truth about the extravagant era, which got its name from a book co-written by Mark Twain, when wealthy railroad magnates and other arrivistes were upending late 19th-century New York City society and culture.

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The Gilded Age
America in the Gilded Age and Progressive Era
The Age of Innocence
Birdie and Jay
The Heiress Hunt
The Gilded Gentleman
American Heiresses of the Gilded Age
American Colossus
The Alienist
Vanderbilt
The Richest Woman in America
The Gilded Age