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.
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.
The rest of the population whose property fell below this were formed into one century and were exempt from military service. After thus regulating the equipment and distribution of the infantry, he rearranged the cavalry. He enrolled from amongst the principal men of the State twelve centuries.