Roman Farming Management: The Treatises Of Cato And Varro is actually two books in one. The first " De Agri Cultura" by Cato the Elder was written in the 2nd century B.C. and is a very straightforward description of how a farm was run in that period. The second more detailed , “Rerum rusticarum libri III” by Varro was written in the 2nd century A.D. and is a much more detailed description of what is needed to run a profitable farm as a business. Both are invaluable windows into ancient farming during the Roman period.