7. Q.FabiusVibulanus, Q. F. M. N., third son of No. 4, was consul B. C. 423 with C. Sempronius Atratinus, consular tribune for the first time B. C. 416 (omitted through accident by Livy, 4.47), and for the second time B. C. 41 4. (Liv. 4.37, 49; Diod. 13.9, 38.) At the beginning of the following year he was interrex. (Liv. 4.51.)