Who created "Mass of St. Gregory"?

Mass of St. Gregory was created by Simon Wynhoutsz Frisius|Jan Gossart (called Mabuse).

What medium is "Mass of St. Gregory"?

Mass of St. Gregory is Etching.

Yes, Mass of St. Gregory is in the public domain and available for free download under CC0 license.

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Simon Wynhoutsz Frisius|Jan Gossart (called Mabuse)