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Also known as: Pope Gregory XIII; Ugo Buoncompagni
Secondary Materials:
M. Ott, The Catholic Encyclopedia Vol. VII (Robert Appleton Co. 1910). [New Advent]
Works
:
Inter Gravissimas ed. Unknown [Les textes constitutifs du calendrier grégorien]
Translations:
French by Rodolphe Audette [Les textes constitutifs du calendrier grégorien]
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