The objective of this article is to review the arguments of the Roman lawyers of the 3rd century on the problems of delegatio and exceptio doli. The methodology is based on the analisis of fragments, excluding a textual-based critic. The results of the research show that the Roman lawyers of the last period of the classical jurisprudence preferred to strenghthen the position of the creditor, by limiting the extent of the exceptio doli when used by the debtor.