sentences:  Italy had traditionally been exempt from any form of taxation, but Galerius ignored this precedent, and the officers of the revenue already began to number the Roman people, and to settle the proportion of the new taxes.Italy began to murmur against this indignity and Maxentius used this sentiment to declare himself emperor in Italy, to the fury of Galerius.Therefore, Galerius ordered his colleague Severus to immediately march to Rome, in the full confidence that, by his unexpected arrival, he would easily suppress the rebellion.