AFAIK it's not at all uncommon for artists of old paintings to be unknown. Especially for religious paintings like this. (if anything it's the default) For ins

AFAIK it's not at all uncommon for artists of old paintings to be unknown. Especially for religious paintings like this. (if anything it's the default) For instance: https://en.wikipedia.org/wiki/Master_of_the_Golden_Altar https://en.wikipedia.org/wiki/Master_of_the_Golden_Altar Wikipedia even has a list listing many 'Master of X' artists: https://en.wikipedia.org/wiki/Category:Anonymous_artists https://en.wikipedia.org/wiki/Category:Anonymous_artists