Matilda effect
Trotula (Trota of Salerno, 12th century) – Italian physician, author of works which, after her death, people said had really been written by men.  Some people were so against women being teachers and healers that they said Trotula had never really lived. At first, people said her husband and son wrote her work, but later, monks confused her name for that of a man. She is not in the "Dictionary of Scientific Biography"