Hathui (also Hadwig and Hedwig) (born c. 939; died 4 July 1014)[1] was a member of the Saxon House of Billung, who was the first abbess of Gernrode (r.959-1014).
In 952, when she was about thirteen years old, Hathui married Siegfried, son of Margrave Gero of the Saxon Eastern March, who stood high in Otto I's favour.
[6] Hathui was also abbess of Vreden,[7] where she shared the office of advocate with her nephew, Wichmann III, son of Eckbert.
Hathui is said to have cared for and healed the sick at the ‘Sacred Pool’ (Heiliger Teich) south of Gernrode.
After her death in 1014 the water of the pool is said to have turned first blood-red, then bright green, before returning to its normal colour.