1480
Apr 18, Lucretia Borgia (d.1519), murderess, was born. Lucrezia Borgia, Duchess of Ferrara, was the daughter of Pope Alexander VI, and the sister and political pawn of Cesare Borgia. She was also considered a patroness of the arts.

1518
Apr 18, Bona Sforza (1494-1558) was crowned Queen of Poland and Grand Duchess of Lithuania in Wawel Cathedral, Krakow. The Italian niece of Bianca Maria Sforza, who in 1493 married Holy Roman Emperor Maximilian I, became the 3rd consort of Lithuania’s Grand Duke Sigismund the Old (1467-1548).

1956
Apr 18, Actress Grace Kelly married Prince Rainier III of Monaco in a civil ceremony. A church wedding took place the next day.

2007
Apr 18, Ultrasound machines in India, primarily sold by GE, were reported to be linked to a declining sex ratio, even though laws forbade doctors from disclosing the sex of fetuses. Female fetuses were widely aborted due to high dowry costs.

2011
Apr 18, In North Carolina Crystal Mangum (32) was indicted on a charge of first-degree murder and two counts of larceny. She has been in jail since April 3, when police charged her with assault in the stabbing of her boyfriend Reginald Daye (46). He died after nearly two weeks at a hospital. Mangum had falsely accused white lacrosse players of raping her at a 2006 party for which she was hired to perform as a stripper.