Arthur Finds the Crown of Diamonds
by: George Wooliscroft Rhead (Artist) , Louis Rhead (Artist)
from: Idylls of the King: Vivien, Elaine, Enid, Guinevere (P. 57) -  1898
This picture illustrates the lines from Tennyson's "Lancelot and Elaine" idyll:
And Arthur came, and labouring up the pass,
All in a misty moonshine...