Leuven, Stalburch, Jan van, Portrait of Gemma Frisius, verso - stamped, Portrait of the learned Gemma Frisius, who wrote about the basic principles of astronomy and cosmography. Frisius is sitting in his study with bookcase, at a table on which lie a globe and various astronomical instruments. He is wearing a paltrok and cloak and a bonnet on his head., print, engraving, prints, engravings, height 303 mm, width 237 mm, Zuid-Nederlands, print maker, printmaker, 1557 - 1557, third quarter 16th century, paper, papier, engraving (printing process)