de bello gallico, 6.15

The other class is that of the knights. These, when there is advantage and any war occurs (which before the arrival of Caesar was generally accustomed to happen every year, as either they themselves were inflecting injuries or repelling those inflected on them), are all engaged in war; and, of those in proportion as is most distinguished by birth and resources, thus have the greatest number of slaves and dependents about them. They know this one influence and power.