According to the book description of The Onyx King, it is “Set in the thirteenth century, The Onyx King follows the story of Agymah, the despised and rejected son of a concubine. Owing to the persistence of his mother, though, King Abbuci eventually agrees to send Agymah to the prestigious University of Cambridge. There, The Forgotten Son vows to acquire all of the knowledge and resources he can before returning to liberate his oppressed countrymen, the Fabuciin tribe.”