Herodian (late second, first half third century): Greek historian, author of a History of the Roman Empire since the Death of Marcus Aurelius in which he describes the reign of Commodus (180-192), the Year of the Five Emperors (193), the age of the Severan dynasty (211-235), and the Year of the Six Emperors (238).
The translation was made by Edward C. Echols (Herodian of Antioch's History of the Roman Empire, 1961 Berkeley and Los Angeles) and was put online for the first time by Roger Pearse (Tertullian.Org). The version offered on these pages is hyperlinked and contains notes by Jona Lendering.
Severus' Against Albinus
[3.6.1]  When he was informed of what had occurred, Severus took effective and energetic action; by nature quick to anger, he no longer concealed his hostility toward Albinus. Calling together the entire army, he spoke to them as follows: "Let no one charge us with capricious inconsistency in our actions against Albinus, and let no one think that I am disloyal to this alleged friend or lacking in feeling toward him.
[3.6.2] We gave this man everything, even a share of the established empire, a thing which a man would hardly do for his own brother. Indeed, I bestowed upon him that which you entrusted to me alone. Surely Albinus has shown little gratitude for the many benefits I have lavished upon him.
[3.6.3] Now he is collecting an army to take up arms against us, scornful of your valor and indifferent to his pledge of good faith to me, wishing in his insatiable greed to seize at the risk of disaster that which he has already received in part without war and without bloodshed, showing no respect for the gods by whom he has often sworn, and counting as worthless the labors you performed on our joint behalf with such courage and devotion to duty.
[3.6.4] In what you accomplished, he also had a share, and he would have had an even greater share of the honor you gained for us both if he had only kept his word. For, just as it is unfair to initiate wrong actions, so also it is cowardly to make no defense against unjust treatment. Now when we took the field against Niger, we had reasons for our hostility, not entirely logical, perhaps, but inevitable. We did not hate him because he had seized the empire after it was already ours, but rather each one of us, motivated by an equal desire for glory, sought the empire for himself alone, when it was still in dispute and lay prostrate before all.
[3.6.5] But Albinus has violated his pledges and broken his oaths, and although he received from me that which a man normally gives only to his son, he has chosen to be hostile rather than friendly and belligerent instead of peaceful. And just as we were generous to him previously and showered fame and honor upon him, so let us now punish him with our arms for his treachery and cowardice.
[3.6.6] His army, small and island-bred, will not stand against your might. For you, who by your valor and readiness to act on your own behalf have been victorious in many battles and have gained control of the entire East, how can you fail to emerge victorious with the greatest of ease when you have so large a number of allies and when virtually the entire army is here. Whereas they, by contrast, are few in number and lack a brave and competent general to lead them.
[3.6.7] Who does not know Albinus' effeminate nature? Who does not know that his way of life has prepared him more for the chorus than for the battlefield? Let us therefore go forth against him with confidence, relying on our customary zeal and valor, with the gods as our allies, gods against whom he has acted impiously in breaking his oaths, and let us be mindful of the victories we have won, victories which that man ridicules."
[3.6.8] When Severus had finished speaking, the entire army called Albinus enemy and shouted their approval of Severus, promising him their wholehearted support; as a result, he was inspired even more and encouraged to anticipate greater things. After making generous gifts to the soldiers, Severus publicly announced his expedition against Albinus.
[3.6.9] He also sent troops to continue the siege of Byzantium, which was still under blockade because the soldiers of Niger had fled there.note[Herodian's chronology is confused. Severus beat Niger on 31 March 194. After this, Severus invaded Mesopotamia for the first time (195); he appointed his son Caracalla as caesar in 196 and declared war on Albinus after his return to Rome in that same year. Byzantium had fallen in 195.] At a later date Byzantium was captured as a result of famine, and the entire city was razed. Stripped of its theaters and baths and, indeed, of all adornments, the city, now only a village, was given to the Perinthians to be subject to them; in the same way Antioch was given to the Laodiceans. Severus made available a huge sum of money for rebuilding the cities destroyed by Niger's soldiers.
[3.6.10] [Winter 196/197] The emperor himself set out on the march, scorning heat and cold alike, and gave the army no respite for holidays or rest. Often when he was journeying through very high and very cold mountains, the emperor strode along bareheaded through rain and snow, setting an example of courage and constancy for his soldiers, who endured hardships not only from fear and from training but also in imitation of their emperor. Severus sent a general ahead with a unit of soldiers to seize the passes of the Alps and guard the approaches to Italy.