Kyneburga/Cyneburg(a) lived in the 7th century and was the daughter of King Penda of Mercia. She was also the founder of a an abbey and is therefor remembered by the Catholic Church. Some sources state that she was a queen and canonized.
That sites gives the origine of the name Cyneburga as Old English. According to a German site I looked at it is either Old English or Old German. That makes me wonder about the history of the English and German language. What was the language called that both languages originate from? How long could it have taken until English and German native speakers had to study the language of the other to be able to communicate with each other?
Kyneburga had a relative named Tibba. Do you have any information about the name?