His subjects are generally austere, representing anchorets, prophets,
apostles, &c., and frequently of the most revolting character, such as
sanguinary executions, martyrdoms, horrid punishments, and lingering
torments, which he represented with a startling fidelity that
intimidates and shocks the beholder. His paintings are very numerous,
and his drawings and etchings are highly esteemed by connoisseurs.