John Ruskin (8 February 1819 – 20 January 1900) was an art critic and social thinker as well as an artist and poet.
His writings on art and architecture were extremely influential during his lifetime. He became well known for his outspoken defence of J. M. W. Turner and the idea of naturalism in art. He also strongly supported the Pre-Raphaelite movement.
Ruskin taught drawing classes at in the university galleries at Oxford University, which subsequently became the Ashmolean Museum. The Ashmolean still holds the collection of artworks which he assembled for teaching purposes, including 848 drawings and watercolours , 422 prints, 158 photographs, illuminations and manuscripts, and others.
The Elements of Drawing website has high quality images of his teaching collection, as well as much more information about his time at Oxford.