Cwenthryth was also the Abbess of Minster-in-Thanet who inherited property and authority from King Coenwulf of Mercia. Wulfred, Archbishop of Canterbury, challenged her for the authority over her abbey estates. She was ultimately compelled to resign.
- "AngloSaxon England (821)". britannia.com. Retrieved 17 November 2014.
- The Dictionary of National Biography, Volume 63 By Sir Sidney Lee p.173