There seems to be no doubt about the existence of a grom​aticus named Marcus Iunius Nipsus, even if the attribution of the three short writings preserved under his name in the Corpus agrimensorum Romanorum has been repeatedly questioned by critics. Jelle Wietze Bouma, the most recent editor of two of the writings, Fluminis varatio and Limitis repositio, (1993), is now inclined to believe that the attribution to Nipsus is authentic. Nicolaus Bubnov, editor of the third work, Podismus, in 1899, believed that Nipsus' works originally contained in the corpus had been lost and that the false attribution was due to damages of manuscript and loss of leaves. The traditional dating of Nipsus to the 2nd century AD, questioned and moved to late antiquity by Dilke based on his latin (1971), is also considered reasonable by Bouma. A high dating could be supported by the tria nomina, which let us suppose he was a Greek freedman of the house of Iunii (Cantor 1875); in a later age usually the names were more than three. However, no evidence in this sense has been identified and no Roman inscription is found bearing the name Nipsus. In the literary tradition, Diodorus and Plutarch speak of a Nypsios from Naples. In summary, we can agree with what Bouma says: “Marcus Iunius Nypsus is an obscure person of whom very little is known” (Bouma 1993, 16). [R. Tabacco]