Benedict XIII (originally Pedro de Luna) spent more than 20 years as antipope during the Western Schism that split the Roman Catholic Church from 1378 to 1417.
Benedict XIII. (2013). The Biography Channel website. Retrieved 05:43, Jun 20, 2013, from http://www.biography.com/people/benedict-xiii-13531466.
Benedict XIII. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/benedict-xiii-13531466 [Accessed 20 Jun 2013].
"Benedict XIII." 2013. The Biography Channel website. Jun 20 2013, 05:43 http://www.biography.com/people/benedict-xiii-13531466.
"Benedict XIII," The Biography Channel website, 2013, http://www.biography.com/people/benedict-xiii-13531466 [accessed Jun 20, 2013].
"Benedict XIII," The Biography Channel website, http://www.biography.com/people/benedict-xiii-13531466 (accessed Jun 20, 2013).
Benedict XIII [Internet]. The Biography Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.biography.com/people/benedict-xiii-13531466.
Benedict XIII, http://www.biography.com/people/benedict-xiii-13531466 (last visited Jun 20, 2013).
Benedict XIII. The Biography Channel website. 2013. Available at: http://www.biography.com/people/benedict-xiii-13531466. Accessed Jun 20, 2013.