Res Gestae

A large troop of Franks had set out to rescue them from their danger; but on learning that they had been captured and carried off, without venturing on anything further they retired to their strongholds. And Caesar after these successes returned to Paris to pass the winter.

Now since it was expected that a great number of tribes with greater forces would make head together, our cautious commander, weighing the doubtful issue of wars, was perplexed with great burdens of anxiety. So, thinking that during the truce, short though it was and full of business, some remedy might be found for the calamitous losses incurred by the land-holders, he set in order the system of taxation.

And whereas Florentius, the praetorian prefect, after having reviewed the whole matter (as he asserted) stated that whatever was lacking in the poll-tax and land-tax accounts he supplied out of special levies, Julian, knowing about such measures, declared that he would rather lose his life than allow it to be done.