Tantamous (also known as Old Jethro or John Jethro) (c. 1580–1676) was a well-known Native American Nipmuc leader in seventeenth century Massachusetts. Tantamous was a powwow (healer and spiritual leader) who lived near the Assabet River, later in Nobscot (now Framingham). Tantamous "...may have gotten his English name for his good advice."