Diving into the Mikvah at Ostia, Or, When is a Pool Not a Pool?

The discovery of a mikvah or Jewish ritual bath in a house at Ostia Antica, the port of Rome, shows that Jews brought their practices wherever they went. After all, a ritual bath leaves you spiritually clean on the inside and a dip leaves you refreshed on the outside. But the Romans and Christians were also crazy about the water, so whose influence is washing over whom?