The name Pseudo-Agennius Vrbicus is a conventional designation for the author of the Commentum de agrorum qualitate and Commentum de controuersiis. The name Pseudo-Agennius Vrbicus originated in an ancient confusion, occurring in the manuscript tradition itself. The Commentum de controuersiis ends with a long section reproducing a passage from the work of Agennius Urbicus verbatim. This caused the attribution of the two commentaries to Agennius Urbicus himself. In fact, the author of the two commentaries was a Christian who worked as a teacher of land-surveying probably around the mid-sixth century AD. In his two works, the author offers an interpretation of two texts by Frontinus on land-surveying, so that students of the quadrivium would find it easier to learn the principles of that discipline.
The author demonstrates a noteworthy critical maturity in discussing his field of study, and a deep knowledge of the texts included in the Corpus Agrimensorum Romanorum. He makes frequent use of texts on land-surveying from the Corpus in his interpretation of the text of Frontinus.
Good arguments support the hypothesis that the author of these two commentaries on land-surveying was also responsible for preparing the original version of the Palatine collection (π) of the Corpus Agrimensorum Romanorum. [D. Paniagua; translation L. Battezzato]