Herodianus, born around 180 A. D., represents a very important witness for the historical reconstruction of his age. The last critical edition of this author dates back to 1922: it was published by K. Stavenhagen in the Teubner series. Since then there has not been any revision of Herodianus' text; so the edition of Lucarini is a real desideratum in the field of Classical Philology. He has made a new investigation on all the manuscripts which transmit Herodianus' work and he has taken into critical account all the secondary bibliography on it which appeared in the last decades.