Pagliano was a Roman port in the territory of what is now Orvieto. The port was located where the river Paglia merged with the Tiber. In Roman times this was a very important place because of its strategic location.
Roman harbor of Pagliano Orvieto
Useful information

The Porto Romano di Pagliano is located about 6 kilometers south of Orvieto itself, along the Strada Statale Amerina.
History
Pagliano was important because Latium was on the other side of the Tiber River and Umbria was on the other side of the Paglia. This made it an influential trading center.
The oldest archaeological finds date from the Greek, the most recent from the Imperial period.
The first excavations took place in the 18th century.
The ruins were severely damaged in 2012 due to a flood.