1) A ‘common’ barrator was a person who was given to quarrelling or to inciting disputes and law-suits.
c.1535 wythowt that the sayd complenant ys a Common baratrour [sic] or yet a maker of assaltes and Frays, Tadcaster
1598 Matheus Hopey nuper de Yeadon. ... fuit & adhuc est co[mmun]is Barrectator
1638 Richard Wilson ... a common Barretor ... committed to gaole, Bradford. The offence was called barratry: 1607 for barratry and promoting of strife, quarrels ... and as a fighter in church, West Appleton.