This oil-on-canvas self-portrait, entitled Philosophy, dates from around 1645 and shows Rosa wearing a scholar's cap and brown gown, as a personification of philosophy. Half of his face is in shadow, and the cold lighting emphasises his long, narrow nose, his furrowed brow and unkempt hair. The Latin inscription on the tablet, Aut tace aut loquere meliora silentio, is taken from Stobaeus's Anthologia, and translates to 'Either be silent or say something better than silence'. The painting now hangs in the National Gallery, London.Painting credit: Salvator Rosa