The artist has previously been referred to as the 'Master of Saint Ansano', but has now been identified as Pietro di Ruffolo. For more information on the artist, see M. Merlini, Pittura tardogotica a Siena: Pietro di Ruffolo, il 'Maestro di Sant'Ansano, e il cantiere de Lecceto', in Prospettiva, July-October 1999, nos. 95-96, pp. 92-111.
We are grateful to Everett Fahy for suggesting the attribution, having seen the painting in person. He has suggested a date of circa 1455 for this work.