John Donald Merrett (17 August 1908 – 16 February 1954) was a British murderer and convicted fraudster also known under the name of Ronald John Chesney in later life. He left a wide trail of damage but escaped with minimal punishment.

Salvatore Mancuso Gómez, also known as "el Mono Mancuso", "Santander Lozada" or "Triple Cero" (i.e. "Triple Zero", or, "000"), among other names (born August 17, 1964 in Montería, Córdoba) is a Colombian paramilitary leader, once second in command of the United Self-Defense Forces of Colombia (AUC) paramilitary group.

Mohammed Emwazi (born Muhammad Jassim Abdulkarim Olayan al-Dhafiri; Arabic: محمد جاسم عبد الكريم عليان الظفيري;‎, commonly referred to as Jihadi John (17 August 1988 – 12 November 2015) was a British militant of Kuwaiti origin seen in several videos produced by the Islamist extremist group Islamic State (IS) showing the beheadings of a number of captives in 2014 and 2015. A group of his hostages nicknamed him "John" since he was part of a four-person terrorist cell with English accents whom they called 'The Beatles'; the press later began calling him "Jihadi John".