person

M. Piso

also: Marcus Piso

M. Pupius Piso Frugi Calpurnianus, adopted from the Calpurnii Pisones; quaestor under Carbo in 83, praetor c. 72, consul 61 BC. A man of Greek learning, host of Cicero's youth (De fin. 5), and an unstable optimate (cf. Phil. 2.62; Verr. 2.1.37; Pro Planc. 51). The man under whom Verres rendered his Cinnan accounts.

Reading notes

Ad Atticum 1.13 §2 The consul himself is small-spirited and crooked
The consul of 61 BC, M. Pupius Piso Frugi Calpurnianus, who as presiding magistrate covertly favoured Clodius and obstructed the bill against the Bona Dea sacrilege. "His colleague" just below is the other consul, M. Valerius Messalla Niger.
On the Ends of Good and Evil §4.73 Wittily our friend Marcus Piso used to mock the Stoics
Marcus Pupius Piso Frugi, a noted Roman of Peripatetic leanings (and the chief speaker of De Finibus Book 5), is recalled here for his joke that 'preferred' is merely a longer word than 'good.' His point is that Zeno valued wealth no less than Aristotle while pretending otherwise.
On the Ends of Good and Evil §5.1 M. Piso
Marcus Pupius Piso Frugi Calpurnianus, consul of 61 BC, an orator with strong Peripatetic and Academic sympathies. He is the chief speaker of Book 5, expounding the ethics of Antiochus and the Old Academy.