The Civil Wars, Book 1 by Julius Caesar

Caesar, although he was not as yet at open enmity with him, determined neither to aid him by his influence nor openly oppose him on this occasion. But the consuls Lentulus and Marcellus, who had previously been on unfriendly terms with Caesar, resolved to use all means in their power to prevent him from gaining his object. Marcellus in particular did not hesitate to offer Caesar other insults. Caesar had lately planned the colony of Novumcomum in Gaul: Marcellus, not content with taking from it the right of citizenship, ordered the principal man of the colony to be arrested and scourged at Rome, and sent him to make his complaints to Caesar: an insult of this description had never before been offered to a Roman citizen.