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Catholic Encyclopedia
http://www.newadvent.org/cathen/04781a.htm
St. Didacus, Franciscan lay brother, d. 1463.
Catholic Online
http://saints.catholic.org/saints/didacus.html
Pious hagiography of St. Didacus.
For All the Saints
http://www.saintpatrickdc.org/ss/1113.htm#diaz
Short biography of St. Didacus of Alcalá.
Patron Saints Index
http://www.catholic-forum.com/saints/saintd14.htm
Profile of St. Didacus, also known as Diego or Diaz.