Suetonius, Otho 11: "On the ninety-fifth day of his reign". Suetonius probably assumed Otho died on 19 April, the day in which Vitellius was formally installed as emperor.
Cassius Dio63.15: "He had lived thirty-seven years, lacking eleven days, and had reigned ninety days". This seems to give 15 April as Otho's date of death. However, "thirty-seven years lacking eleven days" actually gives 16 April.[n. 1] This can be explained by placing Otho's ascension on 16 January. Other historians give similar dates.[16][17][18][19]
web.archive.org
Donahue 1999. Donahue, John (7 August 1999). "Galba". De Imperatoribus Romanis. Archived from the original on 11 March 2022. Retrieved 25 March 2019.
