Münzer (RE no. 166) suggested that Q. Fabius Ambustus Vibulanus, Cos. 412, should be identified with Vibulanus. However there is no mark of iteration in any of our sources for 412. See the arguments of Degrassi (97) against Münzer's view. (Broughton MRR I)
Liv. 4.37.1, and 40.2; Chr. 354 (Arretino et Vivullano); Fast. Hyd. (Atratino et Vibulano), so also Chr. Pasc.; Cassiod.; on Sempronius, Val. Max. 3.2.8. See Degrassi 96, 374f. For endangering his army in the war with the Volscians Sempronius was placed on trial in 422 and finally convicted and fined in 420 (Liv. 4.37-44; cf. Dion. Hal. 12.6.5; Val. Max. 3.2.8; 6.5.2). (Broughton MRR I)
Tribunus Militum Consulari Potestate
416
(Broughton MRR I)
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Liv. 4.47.8 (who omits Fabius, but lists him as Mil. Tr. iterum at 4.49.7); Diod. 13.9.1; Fast. Cap. (A. Sempronius L. f. A. n. [- -]; Q. Fabius Q. f. M. n. [- -]); Chr. 354 (Arratino III et Mugillano II); Degrassi 26f., 97, 376f. On Papirius, see Lübker no. 15. (Broughton MRR I)