Peter Goullart (1901-1978) was a Russian-born traveler, explorer and author, who is best known for a number of books describing the life and customs of various peoples living in remote parts of East and Southeast Asia.
This book is not in fact by an unknown author, but is by Peter Goullart. He is the author of 'Forgotten Kingdom' which I have also read recently. The Princes of the title are tribesmen living on the borders of Tibet and China, known to the Chinese as Lolos but calling themselves Yi. Goullart lived and worked in the area for a couple of years and got to know the people well. He travelled extensively, often in dangerous situations, and met local people at all levels of society. The book gives a vivid description of the area, its wildlife, scenery and inhabitants. He was there just as the modernisation of China was starting and the world he describes is now gone. We are lucky to have such a good writer to record it.