When did Matthew Hopkins discover witches?

Matthew Hopkins, known as the "Witchfinder General," did not actually discover witches but played a significant role in the witch hunts in England during the 17th century. His activities peaked between 1644 and 1647 during the English Civil War, particularly in East Anglia. He was responsible for the trial and execution of numerous individuals accused of witchcraft, capitalizing on the hysteria surrounding witch hunts at the time.