[2] The name Johannes Barontius appears in the signature of a polyptych representing the Madonna and Child Enthroned with Saints (Galleria Nazionale delle Marche, Palazzo Ducale, Urbino).
However, from a document of 1362, which records the painter's tomb in the church of San Giuliano in Rimini it is clear that it was a patronymic.
[2] The polyptych representing the Madonna and Child Enthroned with Saints (Galleria Nazionale delle Marche, Palazzo Ducale, Urbino) is the only secure basis for reconstructing his oeuvre.
His Scenes from the Life of Christ (mid 1340s, Metropolitan Museum of Art) shows that Baronzio was a competent craftsman using a delicate range of colours.
Baronzio paid much attention to detail and used chromatic effects and decorative patterns as was common in the ossified traditions of the local school in its later stages.