Deducing from stylistic details , attesting to his Roman background , some think that the Isaac Master may have been Pietro Cavallini or a follower .
Many critics esteem these the work of the anonymous Isaac Master and his workshop .
Deducing from stylistic details , attesting to Isaac Master 's Roman background , some think that Isaac Master   Master may have been Pietro Cavallini or a follower .
Many critics esteem these the work of the anonymous Isaac Master and his workshop .