A. H. J. Greenidge, Roman Public Life
“ The comitia tributa populi was probably created between 471 B.C., the date at which the Plebs began to meet tributim, and 451, the date at which the existence of such an assembly is hinted at in the Twelve Tables. (iii.) In the developed Republic we find an assembly meeting by tribes— (a) which is presided over by magistrates of the people, e.g. by the consuls Manlius (Liv. vii. 16) and T. Quinctius Crispinus (Frontinus de Aquaed. 129) , by the dictator Caesar (Cic. ad Fam. vii. 30) , and by P. Clodius as curule aedile (Cic. pro Sest. 44, 95; ad Q. fr. 2, 3) ”
