 Mrs. Mendoza had with her a painting she thought to be by Gregorio Vazquez Arce y Ceballos, a well-known Colombian artist about whom Martinez Delgado had written a book.Based on the fact that Martinez was considered an expert in Art History and Arce y Ceballos, she asked him to attribute the piece.As soon as Master Martinez laid eyes on the painting he immediately knew that it was either by Raphael Sanzio or by someone in his school.