 Eustace was the second out of seven sons of Sir John Folville, a respectable member of the gentry who acted on many occasions as a Commissioner or Knighe Shire for both Rutland and Leicestershire.Eustace's elder brother, also Sir John Folville, inherited all of his father's lands in 1309 and kept out of most (but not all) of the law-breaking of his younger brothers.Upon the death of the well respected King Edward I, aka the ""Hammer of the Scots"", he was succeeded by his son Edward II who did not inherit his father's abilities.