Ilkka SYVÄNNE: The Reign of Emperor Gallienus: The Apogee of Roman Cavalry, South YorkShire, Pen & Sword Military, 2019, 212 pp., ISBN 978-1 52674521 7. (2019). Revista Universitaria De Historia Militar, 8(17), 306-309. https://doi.org/10.53351/ruhm.v8i17.548