Gregorii XIIII Papae Litterae monitoriales ad principes, duces, marchionesm &c. et archiepiscopos, episcopos aliosque ecclesiasticos regni Francorum, qui regis partes sequuntur, et ad eas Turonense senatusconsultum
Version 3 can be requested by using "Content Negotiation" as described in IIIF API Version Switching