Lippo Memmi
Research in the 1920s began to separate the works of Lippo Memmi from those of Guido da Siena. It was also accepted that an artist bearing the name Barna was a fellow student under Simone Martini and an artistic collaborator with Memmi. In attributing the panel of St. Agnes to Memmi, Heaton states that it is “...a panel endowed with unity of design and characteristics rarely found in the works of an artist not possessing a more independent, creative personality than is usually predicated of Lippo Memmi”.