Lucius Aemilius Mamercinus was a Roman politician and general who, in the early 4th century BC, held the office of consular tribune an extraordinary six times in his distinguished, yet mostly unknown, career.
He was a member of the family of the Aemilii Mamercini, a branch of the patrician Aemilia gens which had achieved its first consulship in 484 BC and regularly attained consular honors since then.
This year was a quiet one, as no military campaign was undertaken, however, there were a few notable actions within the city, with a temple to Mars being dedicated and four new voting tribes being established.
In this term, he served with Lucius Valerius Poplicola, Publius Valerius Potitus Poplicola, Servius Cornelius Maluginensis, Licinus Menenius Lanatus, Gaius Sulpicius Peticus, Gnaeus Sergius Fidenas Coxo, Tiberius Papirius Crassus, and Lucius Papirius Mugillanus.
In this year, there was a civil disturbance between the patricians and plebeians, which caused the Praenestines, whom the Romans were still at war with, to attack the city, resulting in the naming of a dictator to defeat them.