'Mad Mab' is an old hermit who lives happily with her family of pigs, including her 'baby', Rutterkin. Edgar of Huntingdon, Robert's uncle, captures Rutterkin and later Mab, accusing the old woman of being a witch (and the pig her familiar), paid by the Earl, Robert's father, to cause the death of King John, who has been beset by a mysterious illness. The Earl is arrested for treason and sentenced to death. In trying to rescue him, most of the outlaw band is taken as well. (thetvdb.com)