 Much discussion has been held as to who is the Master.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 or Giotto.Whomever, the Master seems to have been familiar with the Roman artists Filippo Rusuti and Jacopo Torriti, as well as with the work of Cimabue from Florence.