Cyneburg (also Kyneburga) was a female member of the Mercian (today part of the United Kingdom) royal family in 7th century England and was venerated as a saint. Her name day is September 15. https://en.wikipedia.org/wiki/Kyneburga,_Kyneswide_and_Tibba
https://en.wikipedia.org/wiki/Kyneburga,_Kyneswide_and_Tibba