1st century BC) was a Roman senator who served as suffect consul in 34 BC, replacing Gaius Memmius and occupying the office from November 1 to the end of December.
Broughton and Ronald Syme refer to him simply as Marcus Herennius; however, K.M.T.
Herennius is a native of Picenum, which Syme notes provided several supporters for Julius Caesar, including Publius Ventidius.
[2] How Herennius supported the cause of Caesar's heir Augustus is unclear; Syme includes his name in a list of several consuls "who have left no record of service to the rulers of Rome but, as sole and sufficient proof, the presence of their names upon the Fasti.
[6] He was probably the father of Marcus Herennius Picens, suffect consul in AD 1.