Short answers, pulled from the story.
Cesare Maccari's most famous painting is Cicero Denounces Catiline, completed in 1888. It depicts Cicero's first speech against Catiline in the Roman Senate in 63 BC and is part of a fresco cycle in the Sala Maccari at the Palazzo Madama in Rome, the seat of the Italian Senate.
Cesare Maccari was born in Siena on the 9th of May 1840, in the Grand Duchy of Tuscany, and died in Rome on the 7th of August 1919. He trained at the Institute of the Fine Arts in Siena before moving to Florence and then Rome.
Maccari painted the Senate meeting in the Senate House, the Curia Cornelia, when the actual event took place in the Temple of Jupiter Stator. He also depicted Cicero, who was 43 at the time, as looking older than he was, and Catiline, who was two years older than Cicero, as looking considerably younger.
Between 1882 and 1888, Maccari painted a series of frescoes in the Sala Maccari depicting famous events in the history of the ancient Roman Senate, including Cicero Denounces Catiline, scenes of Appius Claudius Caecus, Marcus Papirius facing the Gauls, and Marcus Atilius Regulus before the Senate.
Maccari designed and completed frescoes for the cupola of the Basilica di Loreto, a project that ran from 1890 to 1907. The work replaced deteriorated frescoes by Cristoforo Roncalli from the second decade of the 17th century, and depicts events leading to the proclamation of the dogma of the Immaculate Conception in 1854.
Cicero Denounces Catiline has been reproduced in many textbooks and histories of Rome, and its depiction of the Roman Senate has influenced how nonfiction books present the Senate of the Roman Republic. Despite documented historical inaccuracies, the painting became a default visual reference for the ancient institution.