The thirty-first day of July.
- 431. Election of Pope Sixtus III
- 904. Thessalonica falls to the Arabs, who destroy the city.
- 1009. Pietro Boccapecora becomes Pope Sergius IV, succeeds Pope John XVIII .
- 1492: Deadline of the Alhambra Decree of March 31, which ordered all Jews and Muslims to convert to Catholicism or be expelled from Spain.
- 1905. Arseny (Chagovtsov) of Winnipeg dedicates the St. Tikhon's Monastery and orphanage.
- 1941. Holocaust: Under instructions from Adolf Hitler, Nazi official Hermann Göring, orders SS general Reinhard Heydrich to "submit to me as soon as possible a general plan of the administrative material and financial measures necessary for carrying out the desired final solution of the Jewish question."
- Saint Banthus, confessor at Trier
- Saint Everard Hanse, martyr
- Saint Germanus (died 448), bishop of Auxerre, confessor (Bruges; Paris)
- Saint Ignatius of Loyola, founder of the Jesuits
- Blessed John Columbini (died 1367)
- Saint Justinus de Jacobis
- Saint Neotus, abbot, confessor (England)
- Saint Tertullinus, priest, martyr (Salzburg)
- Saint Helen of Skofde = Helena of Skoefde, widow, martyr (Sweden, Denmark)
- Saint Joan Antidea Thouret
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