Who were the witch hunters of the 17Th century?

mathew Hopkins was a very famous witch hunter back then and he killed meny old women that he thought were witches. he was a vey evil man and put many people through pain and sufforing. one day he was put to one of his own witch finding methods, were he is tied up and put into a river. if he sinks his is not a witch and if he stayed afloat he was a witch. he floated and was exicuted.