or Arenacus, one of the four towns or larger villages in the island of the Batavi, (Tacitus). Now Arnhem, 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, though manumitted, they were not capable of being Roman citizens. They were the same with what were otherwise called Befiarrii.