Who was the first person to start witch hunts?

If you are speaking of the European Witch Hunts, there was no one person who began it. The Witch Hunts were based off of fear of people who believed in things that were "strange" and "foreign" to them. This led to accusations and executions of mostly women who were poor and single.

However, a couple of people who did greatly contribute to the European Witch Hunts were Sprenger and Kraemer, the authors of the Malleus Maleficarum. This gave a concept of the witches that greatly supported the already widespread witch hunt.

However, Europe was not the first to bring forth the witch hunts. Socery and Witchcraft have been put into law as early as ancient Egypt and Babylonia.