" The Isaac Master, for his elevated technical level, is considered one of the first Italian Gothic painters, distant from the painters of his age. Much discussion has been held as to who the Master was. Some speculate that he was
Gaddo di Zanobi Gaddi (due to similarity with Gaddi's work in Rome and Florence), while others say
Pietro Cavallini,
Arnolfo di Cambio, or
Giotto. The Master seems to have been familiar with the
Roman artists
Filippo Rusuti and
Jacopo Torriti, as well as with the Tuscan artists
Cimabue and
Duccio. In his depictions of volume and dimension, he anticipates some of the advances made by Giotto in his work by about a decade; for this reason, he is considered to be a central figure in the . These features also contribute to the theory that he was an artist at the peak of his career or a student of Cimabue, perhaps a very young Giotto. For many decades, the traditional attribution of the frescoes of the
Vita di San Francesco in the Upper Basilica has been questioned, particularly by English art historians like Rintelen, Oertel, or Meiss. Italian scholars, however, remain mostly convinced by Vasari's attribution of the frescoes to Giotto. The recent conservation by after the
1997 Umbria and Marche earthquake shed new light on the debate. Zanardi supported the opinion of
Federico Zeri that thought the frescoes executed by a painting of the Roman school, perhaps
Pietro Cavallini, the only great Gothic painter not confirmed to have contributed to the basilica, or his contemporaries
Filippo Rusuti and
Jacopo Torriti. The frescoes are close to both Cavallini's techniques and his saturated and warm color palette: they are similar to his frescoes at
Santa Cecilia in Trastevere. Still, the accepted attribution is still to Giotto or, less often,
Arnolfo di Cambio. ==References==