Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
The Third Class he formed of those whose property fell as low as 50,000 lbs.; these also consisted of twenty centuries, similarly divided into seniors and juniors. The only difference in the armour was that they did not wear greaves.
In the Fourth Class were those whose property did not fall below 25,000 lbs.
They also formed twenty centuries; their only arms were a spear and a javelin. The Fifth Class was larger, it formed thirty centuries. They carried slings and stones, and they included the supernumeraries, the horn-blowers, and the trumpeters, who formed three centuries. This Fifth Class was assessed at 11,000 lbs.