or Arenacus, one of the four towns or larger villages in the island of the Batavi, (Tacitus.) Now Arenheim, in Guelderland. E. Long. 5. 20. N. Lat. 52. 2.

ARENARIUS, in antiquity, gladiators who combated with beasts in the arena, or amphitheatre. The arenarii were slaves of the lowest rank; so that, tho' manumitted, they were not capable of being Roman citizens. They were the same with what were otherwise called Bellerii.