The works of the seventh-century writer Virgilius Maro Grammaticus are among the most puzzling medieval texts to survive. Ostensibly a pair of grammars, they swarm with hymns, riddles, invented words, and imaginary writers. Conventionally interpreted either as a benighted barbarian’s unfortunate attempt to write a ‘proper’ grammar, or as a parody of the pedantic excesses of the ancient grammatical tradition, these texts have long been in need of a new reading. Why should a grammarian attack the very notion of authority, thereby destabilising his own position? The search for an answer leads us via patristic exegesis and medieval wisdom literature to the tantalisingly ill-documented reaches of heterodox initiatory traditions. Vivien Law’s book opens important new perspectives on the intellectual life of the early middle ages and on the decoding of medieval literature in general.