What group was XXX a member of?
Peter Faber
Saint Peter Faber, S.J. (French: Pierre Lefevre or Favre, Spanish: Pedro Fabro, Latin: Petrus Faver) (13 April 1506 -- 1 August 1546) was the first Jesuit priest and theologian, who was also a co-founder of the Society of Jesus.
Society of Jesus