plebeian, is not mentioned until the latter period of the republic, whence Cicero (pro Muren. 8) calls the Didii novi homines. The only member of it who obtained the consulship was T. Didius in B. C. 98. In the time of the republic no Didius bore a cognomen.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890