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.
During Umayyad rule, Tripoli became a commercial and shipbuilding center. It achieved semi-independence under Fatimid rule, when it developed into a center of learning. The Crusaders laid siege to the city at the beginning of the 12th century and were able finally to enter it in 1109. This caused extensive destruction, including the burning of Tripoli's famous library, Dar al-'Ilm (House of Knowledge), with its thousands of volumes. During the Crusaders' rule the city became the capital of the County of Tripoli. In 1289, it fell to the Mamluks and the old port part of the city was destroyed. A new inland city was then built near the old castle. During Ottoman rule from 1516 to 1918, it retained its prosperity and commercial importance. Tripoli and all of Lebanon was under French mandate from 1920 until 1943 when Lebanon achieved independence.
Ancient period
Many historians reject the presence of any Phoenician civilization in Tripoli before the 8th (or sometimes 4th) century BCE. Others argue that the north–south gradient of Phoenician port establishments on the Lebanese coast indicates an earlier age for the Phoenician Tripoli.
Tripoli has not been extensively excavated because the ancient site lies buried beneath the modern city of El Mina. However, a few accidental finds are now in museums. Excavations in El Mina revealed skeletal remains of ancient wolves, eels, and gazelles, part of the ancient southern port quay, grinding mills, different types of columns, wheels, Bows, and a necropolis from the end of the Hellenistic period. A sounding made in the Crusader castle uncovered Late Bronze Age, Iron Age, in addition to Roman, Byzantine, and Fatimid remains. At the Abou Halka area (at the southern entrance of Tripoli) refuges dating to the early (30,000 years old) and middle Stone Age were uncovered.
Tripoli became a financial center and main port of northern Phoenicia with sea trade (East Mediterranean and the West), and caravan trade (North Syria and hinterland).
Seleucid Empire
Under the Seleucids, Tripoli gained the right to mint its own coins (112 BCE) which were minted in silver and bronze; it was granted autonomy between 104 and 105, which it retained until 64 BCE. At the time, Tripoli was a center of shipbuilding and cedar timber trade (like other Phoenician cities).
Roman period
During the Roman and Byzantine period, Tripoli witnessed the construction of important public buildings including municipal stadium or gymnasium due to strategic position of the city midway on the imperial coastal highway leading from Antioch to Ptolemais. In addition, Tripoli retained the same configuration of three distinct and administratively independent quarters (Aradians, Sidonians, and Tyrians). The territory outside the city was divided between the three quarters.
During the late 3rd Century, Tripolis was the site of a Roman mint from around 270 to 286.
In 488, Severus of Antioch is baptised at the Church of Saint Leontius at Tripolis (modern-day Tripoli) with Evagrius as his sponsor.
