This shelf gathers primary sources, literary collections, and historical studies concerning Welsh and Manx myth, folklore, language, custom, and religious tradition. Enter through Arthurian and Merlin Traditions for medieval and revival literature, or Folklore and Folk Belief for fairy lore, local testimony, and antiquarian collection.

The root shelf also holds The Mabinogion, bardic and early Welsh materials, Manx folklore, and broad collections that cross those rooms. Named local testimony and vernacular material should be distinguished from the period theories imposed by their collectors.