Mariam Soulakiotis
Abbess Mariam Soulakiotis (c. 1883 – 23 November 1954), née Marina Soulakiotou, also known either to her followers as Mariam of Keratea, or in contemporary media pejoratively as "Mother Rasputin", was a Greek Old Calendarist Orthodox abbess and serial killer who was found guilty of numerous counts of murder, fraud and other crimes, which public prosecutors of the Kingdom of Greece alleged she committed against both laypeople and other nuns in her abbey between 1939 and her arrest in December 1950. During the time period of the crimes she was convicted of, Soulakiotis was neither a member of the mainstream Greek Orthodox Church nor in communion with the other, larger Old Calendarist group (the "Florinites")—she was a devoted follower of Archbishop Matthew Karpathakis of Vresthena, whom both groups consider a schismatic.