Founded in the 7th century BC by the Phoenicians, Tripoli became a Roman city by the end of 2BC. As part of the African Province it was known as Regio Syrtica.
From Schoder's lecture notes:
TRIPOLI: Phoenician, 3 colonies of Tyre, Sidon, Aradus, separated by walls & governed by common senate. Gk-Rom. Osa. Portr.
Vipsania Agrippina(?), wife Tiberius (Tripoli Mus.)
Arch of Marcus Aurelius, c. 170