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Catholic Encyclopedia
http://www.newadvent.org/cathen/06042a.htm
St. Ferdinand III, King of León and Castile, Third Order Franciscan, d. 1252.
Catholic Online
http://saints.catholic.org/saints/ferdinandcastile.html
Short biography of St. Ferdinand III.
For All the Saints
http://www.saintpatrickdc.org/ss/0530.htm#ferd
Biographical portrait of St. Ferdinand III.
Patron Saints Index
http://www.catholic-forum.com/saints/saintf15.htm
Profile of St. Ferdinand III.