Oskar Moritz Ernst ('ernst") Leijden . Aliases: Oskar Moritz Ernst Leijden; Ernst Leijden; Ernst Oscar Maurits Leyden; Ernest Oscar Mauritz van Leyden ( 1892 - 1970 ) was a painter. Oskar Moritz Ernst ('ernst") Leijden s works have been auctioned off multiple times, with realized prices varying according to the size and medium of the artwork, for instance of 149.84 USD for Portret van Joep Kess