Hans Holbein the Younger
Pen and ink and brush over preliminary chalk drawing, grey wash, 21.9 x 14.6 in. (55.6 x 37.1 cm.)
Kunstmuseum Basel, Switzerland
This is a design for a stained glass window. It is unusual in having all four of the saint's attributes in one image: the wild hair, the long beard, the cross saltire, and the book.
Read more about St. Andrew.
Source: Christian Müller; Stephan Kemperdick; Maryan Ainsworth; et al, Hans Holbein the Younger: The Basel Years, 1515–1532, Munich: Prestel, 2006, ISBN 9783791335803, via Wikimedia Commons