Citations
http://www.eyewitnesstohistory.com/plague.htm
http://www.themiddleages.net/plague.html
http://www.historyonthenet.com/Medieval_Life/feudalism.htm
http://www.biography.com/people/st-thomas-aquinas-9187231
http://www.ccel.org/ccel/aquinas
http://www.nndb.com/people/635/000055470/
http://www.middle-ages.org.uk/joan-of-arc.htm