Salvete Omnes,
some years ago I posted about prof. Rostovtzeff's reports on the excavations at Dura Europos, a Roman fortress on the Euphrates frontiers that was captured, after a siege, by the Sassanians and never again functioned as a town & fortress.
Dura Europos site is the sources of the Graffito of the heavy cavalryman
and the horse armor that was preserved there within the destroyed town.
Nowadays it is being preserved at the Yale University.
..
Sassanian helmet from Dura
enjoy
Valete