Quintus Marcius Rex

Quintus Marcius Rex ( 2nd century BC) was a Roman politician of the Marcii Reges, a patrician family of gens Marcia, who claimed royal descent from the Roman King Ancus Marcius. He was a maternal great-grandfather of Julius Caesar.

He was appointed praetor peregrinus in 144 BC under the consulship of Servius Sulpicius Galba and Lucius Aurelius Cotta. The two major Roman aqueducts, Aqua Appia and Aqua Anio Vetus, were greatly damaged and many fraudulent misappropriations of their water reduced the flow.

The Roman Senate commissioned Marcius to repair the channels of two aqueducts and stop the diversion. Additionally, he was given the task to build a bigger aqueduct. He was granted sestertii for construction, and since his praetorship term expired before the aqueduct's completion, it was extended for a year.