Quintilian, Inst. 1, 5, 40 on solecism and Apollonius Dyscolus

Abstract Throughout the history of the Latin grammatical tradition barbarism is regularly described according to the system of the four categories of change known as quadripertita ratio, whereas the description of solecism is more controversial. In the grammatical chapters of his first book, Quintilian attests to the application of the fourfold system to solecism in his age, but he also knows a second tradition, which ends up becoming the predominant theory in Latin grammar and regards solecism as the fault by substitution (inmutatio). Quintilian attributes this tradition to some anonymous grammarians (quidam) who have not been identified yet. After considering Quintilian’s testimony in light of the Greek sources and especially Apollonius Dyscolus’ Syntax, we have concluded that Quintilian and Apollonius may rely on a common source, probably of Alexandrine descent, which separated solecism from the first three categories of change of the fourfold system (addition, subtraction and inversion of the regular word order).