Lucius Julius Marinus Caecilius Simplex was a Roman senator who held several posts in the emperor's service. Simplex was then appointed suffect consul in late 101, with Lucius Arruntius Stella as his colleague.[1] His career is primarily known through inscriptions.
His polyonymous name indicates that Simplex was either adopted, or incorporated his mother's name; the consensus is that he incorporated his mother's name into his.[2] His father has been identified as Lucius Julius Marinus, attested as governor of Lower Moesia in January 97, and whose tenure as suffect consul has been dated around AD 93.[3] His mother is considered a daughter of Gnaeus Caecilius Simplex, one of the suffect consuls of 69.[2]