Haile Selassie I, the last emperor of Ethiopia, was as brilliant as he was formidable. An early proponent of African unity and independence who claimed to be a descendant of King Solomon, he fought with the Allies against the Axis powers during World War II and was a messianic figure for the Jamaican Rastafarians. But the final years of his empire saw turmoil and revolution, and he was ultimately overthrown and assassinated in a communist coup.

Written by Asfa-Wossen Asserate, Haile Selassie's grandnephew, this is the first major biography of this final "king of kings." Asserate, who...