Short answers, pulled from the story.
Paul Delaroche is best known for the Execution of Lady Jane Grey (1833), now in the National Gallery in London, which was the most acclaimed painting of its day. He was widely celebrated for history paintings depicting scenes from English and French history, including Cromwell Gazing at the Body of Charles I and The Princes in the Tower.
Delaroche stopped exhibiting after 1837 following the poor critical reception of his religious painting St. Cecilia and his broader rejection of the Davidian values that shaped French official culture. This led to a self-imposed withdrawal from the government-sponsored Salons.
The Hemicycle is a mural twenty-seven metres long painted by Delaroche at the Ecole des Beaux-Arts in Paris, completed in 1841. It depicts seventy-five great artists from across history gathered around a central elevation of white marble steps, with sculptor Phidias, architect Ictinus, and painter Apelles enthroned at the top. The work was severely damaged by fire in 1855 and restoration was completed after Delaroche's death by Joseph-Nicolas Robert-Fleury.
Delaroche is often quoted as saying "from today, painting is dead," a remark probably made in 1839 when he saw examples of the Daguerreotype, the first successful photographic process.
Delaroche mentored a number of notable artists, including Thomas Couture, Jean-Leon Gerome, and Jean-Francois Millet. Other students included Gustave Boulanger, British history painters Edward Armitage and Charles Lucy, British landscape artist Henry Mark Anthony, and American painter and photographer Alfred Boisseau.
In 2016, Fake or Fortune? investigated a version of Delaroche's Saint Amelia, Queen of Hungary, bought for 500 pounds in 1989 by art dealer Neil Wilson and kept at Castle of Park in Cornhill, Aberdeenshire. Professor Stephen Bann concluded it was the lost original. The painting was sold through Christie's in July 2019 for 33,750 pounds.