
May 31: World No Tobacco Day; Pentecost (Eastern Christianity, 2015); Feast of the Visitation (Roman Catholicism and Anglicanism); Mother's Day in Algeria, France, Morocco and Sweden (2015)
1223 – Mongol invasions: Mongol forces defeated a combined army of Kiev, Galich, and the Cumans at the Kalchik River in present-day Ukraine.
1669 – Citing poor eyesight, English naval administrator and Member of Parliament Samuel Pepys recorded his last entry...