Astounded by #35, and never having heard of Jan Rambouts I discovered the following:
Jan Rombouts the Elder, (c. 1480 in Leuven – 1535 in Leuven), was a Flemish Renaissance painter, glass painter, draftsman, printmaker and glass designer. The subjects of his work are stories from the Old and New Testament and the lives of Christian saints. The details of the life of Jan Rombouts are sketchy. He signed his work with a monogram which had been read by the 19th century city archivist of Leuven Edward van Even as representing the letters IVR.
I’ve found very few fensters attributed to Rombouts, but windows usually are unattributed, so that’s unsurprising.