CAPITOLINUS, JULIUS, a Roman historian who flourished towards the end of the third and beginning of the fourth century. He wrote the biographies of Antoninus Pius, Marcus Aurelius Antoninus, L. Verus, Pertinax, Clodius Albinus, Opilius Macrinus, the Maximini, the Gordians, Maximus, and Albinus. His works are classed with those of Spartianus, Gallicanus, Lampridius, Pollio, and Vopiscus, under the title "Historia Augusta scriptores sex."