Oswald, Saint - Short biographical entry on the king of Northumbria, in the Columbia Encyclopedia. - http://www.bartleby.com/65/os/Oswald-S.html
St. Oswald - King and martyr, d. 642. When his father was killed by the King of the East Angles, Oswald fled to St. Columba's monastery at Iona. Nearly 20 years later Oswald defeated the Britons in battle and reunited the Kingdom of Northumbria. Article in the Catholi - http://www.newadvent.org/cathen/11348c.htm
Oswald, King of Northumbria, Martyr - Biography. With prayer in traditional and contemporary language. - http://elvis.rowan.edu/~kilroy/JEK/08/05.html