Saint Frideswide was (according to legend) daughter of King Didan and Safrida. She founded a church near Oxford, but Prince Alfgar of Mercia decided to marry her. She refused his advances, hiding from him in a tub in the forest. When she returned to Oxford, Alfgar besieged her until he was struck blind. She then prayed to St Margaret of Antioch and St Catherine of Alexandria. The two saints appeared to Frideswide and told her to strike her staff against the ground. Wikipedia
The definitive Wikipedia entry for Frideswide. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Frideswide