Martin Crantz (or sometimes Krantz) of the three, including Ulrich Gering and Michael Friburger, that set up a press at the Sorbonne in 1470 was likely the fellow who had the technical know how how to cast the type itself, hence the name of this new face that is based on his work. This font has been expanded to meet the demands of modern day use but it also contains a number of specialized glyphs that allow for the recreation of text in the manner of his day with such characters as the -rum abbreviation and other handy Renaissance oddities. Since this face was designed prior to 1501 there is no italic variant in keeping with the spirit of historical accuracy.
By the way if anyone was wondering Numbles are the loin of deer. Yummy!