In stage 6, he saves Grumio and Clemens from a dog. It is also revealed that a thief tried to steal Quintus as an infant, but Felix saved Quintus, and when Caecilius found out, he freed Felix.
In Stage 9, Quintus visits the baths with some of his friends on his birthday. He gets a disc, which he throws, accidentally smashing the nose off of a nearby statue. Later on, they dine at Caecilius's house, and Melissa sings.
In the last stage of Book 1, Quintus is not in the house with Metella and Lucia when Mt. vesuvius erupts, and he appears in the next book as one of Ruffila's relatives.