The Monomachy of Mstislav and Rededia

Nikolai Konstantinovich Rerikh, better known as Nicholas Roerich, was a Russian polymath, painter, writer, archaeologist, theosophist, philosopher, and public figure. He is best known for his prolific body of artwork, which spans over 7,000 paintings, and his contributions to a wide array of cultural, political, intellectual, and artistic movements and causes.