“Barrator or Barater (Fr. Barateur, a Deceiver) Is a common mover or maintainer of Suits, Quarrels, or Parts, either in Courts or elswhere in the Country, and is himself never quiet, but at variance with one or other.” Thomas Blount, Nomo-Lexicon: A Law-Dictionary (1670).
barrator
barrator (bar-[schwa]-t[schwa]r), n. A fomenter of quarrels and lawsuits; one who stirs up dissension and litigation among people. — Also spelled barretor. Cf. CHAMPERTOR.