Adelheid Langmann was born in 1306 at Nürnberg to the noble Nürnberger patrician Langmann family. Widowed at the age of 15 (after just a few months of marriage), Adelheid undertook the Dominican vocation, entering the Dominican Convent of Engelthal near Nürnberg in 1327 — the same convent as her contemporary Bl. Christina Ebner (see her entry).
Adelheid spent the 48 years (1327–1375) at Engelthal — undertaking the vocation of the Dominican-nun-mystical writer. She composed her principal literary work, the Offenbarungen (Revelations) — Middle High German vernacular autobiographical account of Adelheid's mystical-ecstatic experiences at Engelthal, one of the principal 14th-century Rhineland-Bavarian Dominican women's-mystical texts.
The Offenbarungen participates in the 14th-century Dominican women's-mystical genre — in institutional parallel with the contemporary works of Bl. Christina Ebner (Little Book of the Overflowing of Grace, Sister-Book of Engelthal), Bl. Margaret Ebner (Revelations, at Medingen), Elsbeth Stagel (Töss Sister-Book), and the broader Dominican women's-mystical literary movement.
The Adelheid-Christina Engelthal spiritual-friendship — producing the documentary interpenetration between the two contemporary Engelthal mystics — became one of the principal documented Catholic women's-mystical spiritual-friendship relationships of the period.
She died at Engelthal on November 22, 1375 at the age of 69.