CAIATIA (mod. Caiazzo), an ancient city of Campania, on the right bank of the Volturnus, I'm. N.E. of Capua, on the road to Telesia. It was already in the hands of the Romans in 3o6 B.c. In the Social War it rebelled from Rome, and its territory was added to that of Capua by Sulla. In the imperial period, however, we find it once more a municipiuro. Caiatia has remains of "Cyclopean" walls, and under the Piazza del Mercato is a large Roman cistern, which still provides a good water supply. The episcopal see was founded in A.D. 966. The place is frequently confused with Calatia (q.v.).