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This "dark and captivating" painting is called Elaine, created by American painter Toby Edward Rosenthal.
In 1874, the publication of "Elaine" sparked intense nationwide discussion. So much so that the following year, when the painting was exhibited in San Francisco, more than 1,000 people lined up daily outside the San Francisco Art Institute to pay for a viewing—the ticket price at the time was 25 cents. Soon after, "Elaine salons" appeared across the country, where people composed memorial songs for "her," and even "Elaine cigars" were sold in stores.
According to media reports, the writer Mark Twain once considered including a scene of this painting in his novel "A Connecticut Yankee in King Arthur's Court."