What is "wihtburh"

Wihtburh (or Withburga) (died 743) was an East Anglia saint, princess and abbess who was possibly a daughter of Anna of East Anglia, located in present-day England. She founded a monastery at Dereham in Norfolk. A traditional story says that the Virgin Mary sent a pair of female deer to provide milk for her workers during the monastery's construction. Withburga's body is supposed to have been uncorrupted when discovered half a century after her death: it was later stolen on the orders of the abbot of Ely. A spring appeared at the site of the saint's empty tomb at Dereham.