Harris lines (HL) are considered a nutritional or pathological stress factor in the study of past populations. This
study attempts to contribute to the knowledge of the causal agents for HL in terms of assessing the health state of the population
of Tarragona in the Roman period. The presence of HL has been analyzed in 614 long bones (214 humeri, 150 femurs
and 250 tibias) from 243 skeletons. No HL have been observed in humeri. The frequencies of HL in femurs are higher
than 27% and in tibias more than 48%. Although no significant differences in the presence of HL is found among age
categories, it seems that the causal agents of these marks acted on individuals from the age of 5, an age from which the
long bones of the lower extremities are more prone to producing HL. The hardened living conditions in the Dark Age of
the Roman period in Spain between the third to fifth centuries A.D. may be the cause of the high prevalence of HL in this
population
