Dictionary of Greek and Roman Biography and Mythology/Herennius 15.

15. M. Herennius, M. f. Picens, was consul suffectus in the last two months of B. C. 34. The cognomen Picens is doubtful. As Picenum was a Sabellian district, Picens may indicate a branch of the Herennia Gens settled therein. [W. B. D.]