The painting is thought to represent the patron saint of lawyers and advocate of the poor. The figure appears to be holding what the gallery describes as “a legal document, which would be appropriate for Saint Ivo”.
Yes, I know, odd mixtures of things that saints are patrons of at times. But really, lawyers and the poor? Is it actually possible to be patron of two things quite as in opposition as that? SPUC and Planned Parenthood perhaps?