This is one of several designs for Launcelot and Elaine worked on in the early part of his career. A complete window c: 1910 exists in the Stained Glass Museum be found at Ely Cathedral and can be viewed on their web site http://www.sgm.abelgratis.com/aboutmus.htm
Andrew Stoddart, F.I.B.G.P. -
This is a design of St George and the dragon.