The Golden Legend - A very popular medieval book of saints' lives, written between 1260 and 1275 by Jacobus de Voragine. - http://www.fordham.edu/halsall/basis/goldenlegend/
Catholic Encyclopedia: Legends of the Saints - The legenda are stories about the saints, and often include a mix of historical fact and unhistorical embellishments. - http://www.newadvent.org/cathen/09128a.htm
Internet Medieval Sourcebook: Saints' Lives - Ancient, Byzantine, and medieval hagiographic original texts, in translation and otherwise, with basic data on the cult of saints, emphasis on historical understanding of the texts. [Note: the word "cult" is a technical term referring to the rel - http://www.fordham.edu/halsall/sbook3.html
Yahoo Groups: Celtic and Old English Saints - Daily messages about the first millennium Saints of Ireland, Scotland, Wales, Brittany, England, Cornwall, and Isle of Man. - http://groups.yahoo.com/group/celt-saints/
Military Martyrs - Information on various soldier saints. Includes early martyrologies translated into English. - http://www.ucc.ie/milmart/