Legend says Rome's founders, Remus and the twin brothers Romulus. The Punic Wars of the 3rd century BC became a key naval base, Rome's most important port. The Romans connected the river with an underground network of tunnels with a sewer system, had garden-parks in Rome on the banks of the river. Trade was boosted by the 20th century silting for a while. Example was thrown after the infamous Cadaver Synod into the Tiber. Horti Agrippinae occupied the present site of S. Peter. The nymphaeum called wrongly the temple of Minerva Medica.