Links for Pope Gregory XIII

CATHOLIC ENCYCLOPEDIA: Pope Gregory XIII
http://www.newadvent.org/cathen/07001b.htm
Pope Gregory XIII - Wikipedia
http://en.wikipedia.org/wiki/Pope_Gregory_XIII
Pope GREGORY XIII
http://www.catholic-forum.com/saints/pope0226.htm
Biography Pope Gregory XIII The Papal Library
http://papal-library.saint-mike.org/GregoryXIII/Biography.html