Public latrine in Ephesus was constructed in the 1st century CE over a channel with an uninterrupted flow of water and the toilet seats, formed by cutting holes into marble benches that line the walls. There were three rows of toilets along three sides of the latrine. 
The toilets were wholes cut in a marble bench, and their total number was 48. In the centre, there was an uncovered pool that collected rainwater and provided refreshment in the hot days of summer. Clients were protected from rain by a wooden roof supported by the columns.
The latrines were erected as a part of a building scheme of the so-called Scholastica Baths that provided greywater for flushing the toilets. In winter, the latrines were kept warm by an underground heating system that funnelled steam from the baths.
In the ancient cities of the Roman period, most of the inhabitants did not have a luxury of a private bathroom or toilet. This privilege was limited to the most prominent and wealthy citizens such as the owners of splendid villas.
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More secrets of Ephesus: amazon.co.uk/dp/8395654014
