John Constable was not a painter back then
I forgot I just remembered the answer but I forgot but once I remember I will let you know
Answer:
Cotton duck fabric, usually stretched across a wooden frame.
The School of Athens - Raphael
Mona Lisa - Leonardo Da Vinchi
Ghent Alterpiece - Jan Van Eyck
Birth of Venus - Botticelli
David - Michelangelo
hope this helps!
please mark brainliest :)