3. M.CocceiusNerva, was the son of the jurist. He must have been a precocious youth, if we rightly understand Ulpian (Dig. 3. tit. i. s. l), when he says that he gave response (publice de jure responsitasse) at the age of seventeen or a little more. He is probably the Cocceius Nerva mentioned by Tacitus (Tac. Ann. 15.72) as Praetor Designatus. He wrote a work De Usucapionibus (Dig. 41. tit. 2. s. 47) as Papinian states; and he is often cited in the Digest under the name of Nerva Filius. Gaius (Instil. 2.195, 3.133) cites Nerva, without saying whether he means the father or the son.