Grimlaicus or Grimlaic was a cleric who lived in ninth- or tenth-century Francia, probably around Metz.
[1] He is known only for the book he wrote on how to lead a solitary life within a monastic community, the Regula Solitariorum.
The Regula begins with a prologue, followed by 69 sections, or chapters.
[2] Grimlaicus dedicated the compilation to his namesake, a priest.
The latter, Mabillon conjectures, lived at the papal court during the pontificate of Formosus.