The Casket Letters—which directly implicated Mary, Queen of Scots, in a plot with James Hepburn, 4th earl of Bothwell, to murder Mary’s husband, Henry Stewart, Lord Darnley—were said to have been discovered this day in 1567.
More Events on this day:
1928: American jazz musician Eric Dolphy was born in Los Angeles.
1905: American playwright and screenwriter Lillian Hellman was born in New Orleans, Louisiana.
Source: Encyclopædia Britannica Online Daily