Writing about 30 GC, the Roman rhetorician Valerius Maximus collected instructive stories on traditional Roman religion and morals in his massive work, Nine Books of Memorable Deeds and Sayings {Factorum ac dictorum memorabilium libri IX}. Valerius marked as unusually sourced a story about a sacrificial father and his repentant son. That story, which is best read as a transformation of the binding of Isaac, may have been a Jewish version of what became the Parable of the Prodigal Son in Luke’s Gospel. In fact, the story was allegorized in relation to the Parable of the Prodigal Son in the medieval exempla collection Deeds of the Romans {Gesta Romanorum}.
Valerius explicitly and implicitly marked this story as unusual.