Evidence of settlement in Tripoli dates back as early as 1400 BCE. In the 9th century, the Phoenicians established a trading station in Tripoli and later, under Persian rule, the city became the center of a confederation of the Phoenician city-states of Sidon, Tyre, and Arados Island. Under Hellenistic rule, Tripoli was used as a naval shipyard and the city enjoyed a period of autonomy. It came under Roman rule around 64 BCE. The 551 Beirut earthquake and tsunami destroyed the Byzantine city of Tripoli along with other Mediterranean coastal cities.