Graciously laid out over the right bank of the Sado river and rising up a gentle slope, Alcácer do Sal has been settled since the earliest of times. Archaeological remains have been found that date back to the Neolithic period not to mention evidence of Greek, Phoenician and other Mediterranean peoples having passed through.
Named by the Romans Salacia Urbs Imperatoria, the location took on major importance for the Empire due to its excellent location alongside the Sado river that was then an important thoroughfare. It was primarily used to transport local products (wheat, olive oil and wine) out to other parts of the Roman empire. At the time, Alcácer was one of the most important inland ports on the Western peninsula further establishing a reputation for manufacturing salt (hence the addition of Sal (salt) to its name) and salting and processing fish.www.visitportugal.com