Catalonia was one of the first of the Roman possessions in Spain, and formed the north-eastern portion of Hispania Tarraconensis.
In 193, as praetor, he carried on a successful war against the insubordinate populations of his recently constituted province of Hispania Citerior.
When in 68 his neighbour Galba, the governor of Hispania Tarraconensis, rose in revolt against Nero, Otho accompanied him to Rome.
Tortosa, the Dertosa of Strabo and the Colonia Julia Augusta Dertosa of numerous coins, was a city of the Ilercaones in Hispania Tarraconensis.
Praetor in 60, he obtained the governorship of Hispania Citerior (19) through the support of Caesar, to whom he was also indebted for his election to the consulship (J7).
Under his friend Vespasian he returned to the service of the state, serving as procurator in Gallia Narbonensis (70) and Hispania Tarraconensis (73), and also visiting the Provincia Belgica (74).