This is Polish artist Henryk Siemiradzki’s depiction of Christians being tied down before they were immolated in First Century Rome as ‘Nero’s Torches.’ Siemiradzki lived from 1843-1902.

People work on the excavation of a Roman mass grave from the end of the 1st century AD, in the Simmering ... Most were aged 20 to 30 years old and generally showed signs of good dental health.