Interior of the Frigidarium or Cold Bath, Caracalla
No luxury can be monopolized by the rich, and it was not long before public bathing establishments, in which a small entrance fee was charged, were built by private capital. Following quickly on the heels of these private enterprises, came the establishment of public baths, then, according to the authority of Pliny, for 600 years Rome needed no medicine but the public baths.
When the public baths were first instituted they were only for the lower classes, who alone bathed in public. The people of wealth and those who held positions of state bathed in their own homes. But this monopoly of the poor was not long enjoyed. In the process of time even the emperors bathed in public among their subjects, and we read of the abandoned Gallienus amusing himself by bathing in the midst of the young and old of both sexes, men, women and children.
In the earlier stages of Roman history a much greater delicacy was observed with respect to promiscuous bathing, even among men, than obtained at a later period. Virtue passed away as wealth increased, and the public baths became places of meeting and amusement where not only did men bathe together in numbers, but even men and women stripped and bathed promiscuously in the same bath.
Some idea of the magnitude of the baths at Rome can be gained from a statement of the number of bathers they could accommodate at one time. The baths of Diocletian, which were perhaps the most commodious of them all, could accommodate at one time 3,200 bathers. One hall of this famous bathing institution was at a later date converted by Michael Angelo into the church of St. Marie de gli Angeli.
The baths of Caracalla, built A. D. 212, were perhaps the most famous of the baths of Rome. They were not as commodious however as many other baths, and they had accommodations at one time for only 1,600 bathers, or just one-half that could be accommodated by the baths of Diocletian.
The following description of the Roman baths, together with the historical sketch of the people of that period who indulged in the luxury, is abstracted from an old dictionary of Greek and Roman antiquities, published in London, England, almost a century ago. The illustrations are from woodcuts appearing in the article.