Grade 9 Up–Ancient Celtic peoples have made lasting contributions to current literature and culture in many parts of the world. Monaghan's 12-page introduction summarizes their possible origins, religious beliefs, languages, society, mythology, and relations with other cultures while the approximately 1000 alphabetically arranged entries describe gods, goddesses, heroes, folkloric elements, sacred sites, objects, and place names. Listings are by the most commonly accepted spelling of each item. Variant spellings often follow.