Cyneburh combines the Old English cyne (royal) and burh (fortress). **Saint Cyneburh (d. c. 680)** was the Anglo-Saxon abbess of Castor in Northamptonshire — daughter of King Penda of Mercia and sister of Saint Cuthberga. She married Alhfrith of Deira before becoming abbess.
Featured in Bede's Ecclesiastical History.
Cyneburh reduces to nine — the number of Mercian abbess.