311 – Roman Emperor Galerius issues Edict of Toleration, ending persecution of Christians in the Roman Empire
1772 – John Clais patents 1st scale
1889 – 1st US national holiday, on centennial of Washington’s inauguration
1935 – World Congress for Women’s Rights concludes in Istanbul
1945 – Concentration camp Munchen-Allag freed
1962 – NASA civilian pilot Joseph A. Walker takes X-15 to 75,190 m
1971 – 25th NBA Championship: Milwaukee beat Balt Bullets in 4 games
1976 – The Betsy Ross Bridge, spanning the Delaware River from Philadelphia, Pennsylvania to Pennsauken, New Jersey opens
1982 – Atlanta Braves win record 12th straight from beginning of season
2021 – 45 killed and 150 injured in a crush of people at the Israeli Lag B’Omer festival at Mount Meron