 Karen L. King notes that "Thomasine Gnosticism" as a separate category is being criticised, and may "not stand the test of scholarly scrutiny".Marcion was a Church leader from Sinope (present-day Turkey), who preached in Rome around 150CE, but was expelled and started his own congregation, which spread throughout the Mediterranean.He rejected the Old Testament, and followed a limited Christian canon, which included only a redacted version of Luke, and ten edited letters of Paul.