July 21, 1970 - Sonya Caleffi Sonya Caleffi (born 21 July 1970) is an Italian serial killer. She was suspected of killing 15 to 18 people and convicted of five of them. Read more …July 21, 1970 - Sonya Caleffi Last updated on 09 April 2026.
July 21, 1671 - Isaac Norris Isaac Norris (July 21, 1671 – June 4, 1735) was a merchant, slave trader and prominent figure in provincial Pennsylvania, including mayor of Philadelphia in 1724. Read more …July 21, 1671 - Isaac Norris Last updated on 09 April 2026.