Euhemerism () is an approach to the interpretation of mythology in which mythological accounts are presumed to have originated from real historical events or personages. Euhemerism supposes that historical accounts become myths as they are exaggerated in the retelling, accumulating elaborations and alterations that reflect cultural mores. It was named for the Greek mythographer Euhemerus, who lived in the late 4th century BC. In the more recent literature of myth, such as "Bulfinch's Mythology", euhemerism is termed the "historical theory" of mythology.